Start converting documentation to Sphinx

15 files changed, 10299 insertions, 0 deletions

diff --git a/docs/source/_static/images/checkerboard.png b/docs/source/_static/images/checkerboard.png
new file mode 100644
index 0000000..72478de
--- /dev/null
+++ b/docs/source/_static/images/checkerboard.png
diff --git a/docs/source/_static/images/checkerboard.sh b/docs/source/_static/images/checkerboard.sh
new file mode 100644
index 0000000..dd045ee
--- /dev/null
+++ b/docs/source/_static/images/checkerboard.sh
@@ -0,0 +1,21 @@
+#!/bin/bash
+
+pbm_to_ppm() {
+	read line; echo "P3"
+	read line; echo "$line"; echo "2"
+	sed "s,0,x,g; s,1,y,g; s,x,$1,g; s,y,$2,g;"
+
+}
+
+../icepack/icepack -uc  -B0 ../tests/example.bin | pbm_to_ppm "0 0 0" "0 0 2" > checkerboard_0.ppm
+../icepack/icepack -ucc -B0 ../tests/example.bin | pbm_to_ppm "0 0 0" "0 1 0" > checkerboard_1.ppm
+../icepack/icepack -uc  -B1 ../tests/example.bin | pbm_to_ppm "0 0 0" "0 1 1" > checkerboard_2.ppm
+../icepack/icepack -ucc -B1 ../tests/example.bin | pbm_to_ppm "0 0 0" "1 0 0" > checkerboard_3.ppm
+../icepack/icepack -uc  -B2 ../tests/example.bin | pbm_to_ppm "0 0 0" "1 0 1" > checkerboard_4.ppm
+../icepack/icepack -ucc -B2 ../tests/example.bin | pbm_to_ppm "0 0 0" "1 1 0" > checkerboard_5.ppm
+../icepack/icepack -uc  -B3 ../tests/example.bin | pbm_to_ppm "0 0 0" "1 1 1" > checkerboard_6.ppm
+../icepack/icepack -ucc -B3 ../tests/example.bin | pbm_to_ppm "0 0 0" "0 1 0" > checkerboard_7.ppm
+
+convert -evaluate-sequence add checkerboard_[01234567].ppm checkerboard.png
+rm -f checkerboard_[01234567].ppm
+
diff --git a/docs/source/_static/images/colbuf.svg b/docs/source/_static/images/colbuf.svg
new file mode 100644
index 0000000..e903e19
--- /dev/null
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diff --git a/docs/source/_static/images/iosp.svg b/docs/source/_static/images/iosp.svg
new file mode 100644
index 0000000..e7b130f
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diff --git a/docs/source/conf.py b/docs/source/conf.py
new file mode 100644
index 0000000..6036d28
--- /dev/null
+++ b/docs/source/conf.py
@@ -0,0 +1,33 @@
+# Configuration file for the Sphinx documentation builder.
+#
+# For the full list of built-in configuration values, see the documentation:
+# https://www.sphinx-doc.org/en/master/usage/configuration.html
+
+# -- Project information -----------------------------------------------------
+# https://www.sphinx-doc.org/en/master/usage/configuration.html#project-information
+
+project = 'Project Icestorm'
+copyright = '2024, YosysHQ'
+author = 'YosysHQ'
+
+# -- General configuration ---------------------------------------------------
+# https://www.sphinx-doc.org/en/master/usage/configuration.html#general-configuration
+
+extensions = ['sphinx_rtd_theme']
+
+templates_path = ['_templates']
+exclude_patterns = []
+
+
+# -- Options for HTML output -------------------------------------------------
+# https://www.sphinx-doc.org/en/master/usage/configuration.html#options-for-html-output
+
+html_theme = 'sphinx_rtd_theme'
+html_theme_options = {
+    "collapse_navigation": True,
+    "sticky_navigation": True,
+    "includehidden": True,
+    "navigation_depth": 4,
+    "titles_only": False
+}
+html_static_path = ['_static']
diff --git a/docs/source/format.rst b/docs/source/format.rst
new file mode 100644
index 0000000..4f88ae9
--- /dev/null
+++ b/docs/source/format.rst
@@ -0,0 +1,154 @@
+Bitstream File Format Documentation
+===================================
+
+General Description of the File Format
+--------------------------------------
+
+The bitstream file starts with the bytes 0xFF 0x00, followed by a
+sequence of zero-terminated comment strings, followed by 0x00 0xFF.
+However, there seems to be a bug in the Lattice "bitstream" tool that
+moves the terminating 0x00 0xFF a few bytes into the comment string in
+some cases.
+
+After the comment sections the token 0x7EAA997E (MSB first) starts the
+actual bit stream. The bitstream consists of one-byte commands, followed
+by a payload word, followed by an optional block of data. The MSB nibble
+of the command byte is the command opcode, the LSB nibble is the length
+of the command payload in bytes. The commands that do not require a
+payload are using the opcode 0, with the command encoded in the payload
+field. Note that this "payload" in this context refers to a single
+integer argument, not the blocks of data that follows the command in
+case of the CRAM and BRAM commands.
+
+The following commands are known:
+
++-----------------------------------+-----------------------------------+
+| Opcode                            | Description                       |
++===================================+===================================+
+| 0                                 | payload=1: Write CRAM Data        |
+|                                   | payload=2: Read BRAM Data         |
+|                                   | payload=3: Write BRAM Data        |
+|                                   | payload=4: Read BRAM Data         |
+|                                   | payload=5: Reset CRC              |
+|                                   | payload=6: Wakeup                 |
+|                                   | payload=8: Reboot                 |
++-----------------------------------+-----------------------------------+
+| 1                                 | Set bank number                   |
++-----------------------------------+-----------------------------------+
+| 2                                 | CRC check                         |
++-----------------------------------+-----------------------------------+
+| 4                                 | Set boot address                  |
++-----------------------------------+-----------------------------------+
+| 5                                 | Set internal oscillator frequency |
+|                                   | range                             |
+|                                   | payload=0: low                    |
+|                                   | payload=1: medium                 |
+|                                   | payload=2: high                   |
++-----------------------------------+-----------------------------------+
+| 6                                 | Set bank width (16-bits, MSB      |
+|                                   | first)                            |
++-----------------------------------+-----------------------------------+
+| 7                                 | Set bank height (16-bits, MSB     |
+|                                   | first)                            |
++-----------------------------------+-----------------------------------+
+| 8                                 | Set bank offset (16-bits, MSB     |
+|                                   | first)                            |
++-----------------------------------+-----------------------------------+
+| 9                                 | payload=0: Disable warm boot      |
+|                                   | payload=16: Enable cold boot      |
+|                                   | payload=32: Enable warm boot      |
++-----------------------------------+-----------------------------------+
+
+Use iceunpack -vv to display the commands as they are interpreted by the
+tool.
+
+Note: The format itself seems to be very flexible. At the moment it is
+unclear what the FPGA devices will do when presented with a bitstream
+that use the commands in a different way than the bitstreams generated
+by the lattice tools.
+
+Writing SRAM content
+--------------------
+
+Most bytes in the bitstream are SRAM data bytes that should be written
+to the various SRAM banks in the FPGA. The following sequence is used to
+program an SRAM cell:
+
+-  Set bank width (opcode 6)
+-  Set bank height (opcode 7)
+-  Set bank offset (opcode 8)
+-  Set bank number (opcode 1)
+-  CRAM or BRAM Data Command
+-  (width \* height / 8) data bytes
+-  two zero bytes
+
+The bank width and height parameters reflect the width and height of the
+SRAM bank. A large SRAM can be written in smaller chunks. In this case
+height parameter may be smaller and the offset parameter reflects the
+vertical start position.
+
+There are four CRAM and four BRAM banks in an iCE40 FPGA. The different
+devices from the family use different widths and heights, but the same
+number of banks.
+
+The CRAM banks hold the configuration bits for the FPGA fabric and hard
+IP blocks, the BRAM corresponds to the contents of the block ram
+resources.
+
+The ordering of the data bits is in MSB first row-major order.
+
+Organization of the CRAM
+------------------------
+
+|Mapping of tile config bits to 2D CRAM|
+
+The chip is organized into four quadrants. Each CRAM memory bank
+contains the configuration bits for one quadrant. The address 0 is
+always the corner of the quadrant, i.e. in one quadrant the bit
+addresses increase with the tile x/y coordinates, in another they
+increase with the tile x coordinate but decrease with the tile y
+coordinate, and so on.
+
+For an iCE40 1k device, that has 12 x 16 tiles (not counting the io
+tiles), the CRAM bank 0 is the one containing the corner tile (1 1), the
+CRAM bank 1 contains the corner tile (1 16), the CRAM bank 2 contains
+the corner tile (12 1) and the CRAM bank 3 contains the corner tile (12
+16). The entire CRAM of such a device is depicted on the right (bank 0
+is in the lower left corner in blue/green).
+
+The checkerboard pattern in the picture visualizes which bits are
+associated with which tile. The height of the configuration block is 16
+for all tile types, but the width is different for each tile type. IO
+tiles have configurations that are 18 bits wide, LOGIC tiles are 54 bits
+wide, and RAM tiles are 42 bits wide. (Notice the two slightly smaller
+columns for the RAM tiles.)
+
+The IO tiles on the top and bottom of the chip use a strange permutation
+pattern for their bits. It can be seen in the picture that their columns
+are spread out horizontally. What cannot be seen in the picture is the
+columns also are not in order and the bit positions are vertically
+permuted as well. The CramIndexConverter class in icepack.cc
+encapsulates the calculations that are necessary to convert between
+tile-relative bit addresses and CRAM bank-relative bit addresses.
+
+The black pixels in the image correspond to CRAM bits that are not
+associated with any IO, LOGIC or RAM tile. Some of them are unused,
+others are used by hard IPs or other global resources. The iceunpack
+tool reports such bits, when set, with the ".extra_bit bank x y"
+statement in the ASCII output format.
+
+Organization of the BRAM
+------------------------
+
+This part of the documentation has not been written yet.
+
+CRC Check
+---------
+
+The CRC is a 16 bit CRC. The (truncated) polynomial is 0x1021
+(CRC-16-CCITT). The "Reset CRC" command sets the CRC to 0xFFFF. No zero
+padding is performed.
+
+.. |Mapping of tile config bits to 2D CRAM| image:: _static/images/checkerboard.png
+   :height: 200px
+   :target: checkerboard.png
diff --git a/docs/source/index.rst b/docs/source/index.rst
new file mode 100644
index 0000000..846000d
--- /dev/null
+++ b/docs/source/index.rst
@@ -0,0 +1,14 @@
+Welcome to Project Icestorm
+===========================
+
+.. toctree::
+   :maxdepth: 2
+   :caption: Project Icestorm
+
+   overview
+   format
+   logic_tile
+   io_tile
+   ram_tile
+   ultraplus
+   notes_osx
diff --git a/docs/source/io_tile.rst b/docs/source/io_tile.rst
new file mode 100644
index 0000000..12d09b6
--- /dev/null
+++ b/docs/source/io_tile.rst
@@ -0,0 +1,464 @@
+IO Tile Documentation
+=====================
+
+Span-4 and Span-12 Wires
+------------------------
+
+|IO Tile Span-Wires|
+
+The image on the right shows the span-wires of a left (or right) io cell
+(click to enlarge).
+
+A left/right io cell has 16 connections named span4_vert_t_0 to
+span4_vert_t_15 on its top edge and 16 connections named span4_vert_b_0
+to span4_vert_b_15 on its bottom edge. The nets span4_vert_t_0 to
+span4_vert_t_11 are connected to span4_vert_b_4 to span4_vert_b_15. The
+span-4 and span-12 wires of the adjacent logic cell are connected to the
+nets span4_horz_0 to span4_horz_47 and span12_horz_0 to span12_horz_23.
+
+A top/bottom io cell has 16 connections named span4_horz_l_0 to
+span4_horz_l_15 on its left edge and 16 connections named span4_horz_r_0
+to span4_horz_r_15 on its right edge. The nets span4_horz_l_0 to
+span4_horz_l_11 are connected to span4_horz_r_4 to span4_horz_r_15. The
+span-4 and span-12 wires of the adjacent logic cell are connected to the
+nets span4_vert_0 to span4_vert_47 and span12_vert_0 to span12_vert_23.
+
+The vertical span4 wires of left/right io cells are connected "around
+the corner" to the horizontal span4 wires of the top/bottom io cells.
+For example span4_vert_b_0 of IO cell (0 1) is connected to
+span4_horz_l_0 (span4_horz_r_4) of IO cell (1 0).
+
+Note that unlike the span-wires connection LOGIC and RAM tiles, the
+span-wires connecting IO tiles to each other are not pairwise crossed
+out.
+
+IO Blocks
+---------
+
+Each IO tile contains two IO blocks. Each IO block essentially
+implements the SB_IO primitive from the Lattice iCE Technology Library.
+Some inputs are shared between the two IO blocks. The following table
+lists how the wires in the logic tile map to the SB_IO primitive ports:
+
+================= ================ ============
+SB_IO Port        IO Block 0       IO Block 1
+================= ================ ============
+D_IN_0            io_0/D_IN_0      io_1/D_IN_0
+D_IN_1            io_0/D_IN_1      io_1/D_IN_1
+D_OUT_0           io_0/D_OUT_0     io_1/D_OUT_0
+D_OUT_1           io_0/D_OUT_1     io_1/D_OUT_1
+OUTPUT_ENABLE     io_0/OUT_ENB     io_1/OUT_ENB
+CLOCK_ENABLE      io_global/cen    
+INPUT_CLK         io_global/inclk  
+OUTPUT_CLK        io_global/outclk 
+LATCH_INPUT_VALUE io_global/latch  
+================= ================ ============
+
+Like the inputs to logic cells, the inputs to IO blocks are routed to
+the IO block via a two-stage process. A signal is first routed to one of
+16 local tracks in the IO tile and then from the local track to the IO
+block.
+
+The io_global/latch signal is shared among all IO tiles on an edge of
+the chip and is driven by fabout from one dedicated IO tile on that
+edge. For the HX1K chips the tiles driving the io_global/latch signal
+are: (0, 7), (13, 10), (5, 0), and (8, 17)
+
+A logic tile sends the output of its eight logic cells to its neighbour
+tiles. An IO tile does the same thing with the four D_IN signals created
+by its two IO blocks. The D_IN signals map to logic function indices as
+follows:
+
+============== ===========
+Function Index D_IN Wire
+============== ===========
+0              io_0/D_IN_0
+1              io_0/D_IN_1
+2              io_1/D_IN_0
+3              io_1/D_IN_1
+4              io_0/D_IN_0
+5              io_0/D_IN_1
+6              io_1/D_IN_0
+7              io_1/D_IN_1
+============== ===========
+
+For example the signal io_1/D_IN_0 in IO tile (0, 5) can be seen as
+neigh_op_lft_2 and neigh_op_lft_6 in LOGIC tile (1, 5).
+
+Each IO Tile has 2 NegClk configuration bits, suggesting that the clock
+signals can be inverted independently for the the two IO blocks in the
+tile. However, the Lattice tools refuse to pack two IO blocks with
+different clock polarity into the same IO tile. In our tests we only
+managed to either set or clear both NegClk bits.
+
+Each IO block has two IoCtrl IE bits that enable the input buffers and
+two IoCtrl REN bits that enable the pull up resistors. Both bits are
+active low, i.e. an unused IO tile will have both IE bits set and both
+REN bits cleared (the default behavior is to enable pullup resistors on
+all unused pins). Note that icebox_explain.py will ignore all IO tiles
+that only have the two IoCtrl IE bits set.
+
+However, the IoCtrl IE_0/IE_1 and IoCtrl REN_0/REN_1 do not necessarily
+configure the IO PIN that are connected to the IO block in the same
+tile, and if they do the numbers (0/1) do not necessarily match. As a
+general rule, the pins on the right and bottom side of the chips match
+up with the IO blocks and for the pins on the left and top side the
+numbers must be swapped. But in some cases the IO block and the set of
+IE/REN are not even located in the same tile. The following table lists
+the correlation between IO blocks and IE/REN bits for the 1K chip:
+
+======== ============
+IO Block IE/REN Block
+======== ============
+0 14 1   0 14 0
+0 14 0   0 14 1
+0 13 1   0 13 0
+0 13 0   0 13 1
+0 12 1   0 12 0
+0 12 0   0 12 1
+0 11 1   0 11 0
+0 11 0   0 11 1
+0 10 1   0 10 0
+0 10 0   0 10 1
+0 9 1    0 9 0
+0 9 0    0 9 1
+0 8 1    0 8 0
+0 8 0    0 8 1
+0 6 1    0 6 0
+0 6 0    0 6 1
+0 5 1    0 5 0
+0 5 0    0 5 1
+0 4 1    0 4 0
+0 4 0    0 4 1
+0 3 1    0 3 0
+0 3 0    0 3 1
+0 2 1    0 2 0
+0 2 0    0 2 1
+======== ============
+
+======== ============
+IO Block IE/REN Block
+======== ============
+1 0 0    1 0 0
+1 0 1    1 0 1
+2 0 0    2 0 0
+2 0 1    2 0 1
+3 0 0    3 0 0
+3 0 1    3 0 1
+4 0 0    4 0 0
+4 0 1    4 0 1
+5 0 0    5 0 0
+5 0 1    5 0 1
+6 0 1    6 0 0
+7 0 0    6 0 1
+6 0 0    7 0 0
+7 0 1    7 0 1
+8 0 0    8 0 0
+8 0 1    8 0 1
+9 0 0    9 0 0
+9 0 1    9 0 1
+10 0 0   10 0 0
+10 0 1   10 0 1
+11 0 0   11 0 0
+11 0 1   11 0 1
+12 0 0   12 0 0
+12 0 1   12 0 1
+======== ============
+
+======== ============
+IO Block IE/REN Block
+======== ============
+13 1 0   13 1 0
+13 1 1   13 1 1
+13 2 0   13 2 0
+13 2 1   13 2 1
+13 3 1   13 3 1
+13 4 0   13 4 0
+13 4 1   13 4 1
+13 6 0   13 6 0
+13 6 1   13 6 1
+13 7 0   13 7 0
+13 7 1   13 7 1
+13 8 0   13 8 0
+13 8 1   13 8 1
+13 9 0   13 9 0
+13 9 1   13 9 1
+13 11 0  13 10 0
+13 11 1  13 10 1
+13 12 0  13 11 0
+13 12 1  13 11 1
+13 13 0  13 13 0
+13 13 1  13 13 1
+13 14 0  13 14 0
+13 14 1  13 14 1
+13 15 0  13 15 0
+13 15 1  13 15 1
+======== ============
+
+======== ============
+IO Block IE/REN Block
+======== ============
+12 17 1  12 17 1
+12 17 0  12 17 0
+11 17 1  11 17 1
+11 17 0  11 17 0
+10 17 1  9 17 1
+10 17 0  9 17 0
+9 17 1   10 17 1
+9 17 0   10 17 0
+8 17 1   8 17 1
+8 17 0   8 17 0
+7 17 1   7 17 1
+7 17 0   7 17 0
+6 17 1   6 17 1
+5 17 1   5 17 1
+5 17 0   5 17 0
+4 17 1   4 17 1
+4 17 0   4 17 0
+3 17 1   3 17 1
+3 17 0   3 17 0
+2 17 1   2 17 1
+2 17 0   2 17 0
+1 17 1   1 17 1
+1 17 0   1 17 0
+======== ============
+
+When an input pin pair is used as LVDS pair (IO standard SB_LVDS_INPUT,
+bank 3 / left edge only), then the four bits IoCtrl IE_0/IE_1 and IoCtrl
+REN_0/REN_1 are all set, as well as the IoCtrl LVDS bit.
+
+In the iCE 8k devices the IoCtrl IE bits are active high. So an unused
+IO tile on an 8k chip has all bits cleared.
+
+Global Nets
+-----------
+
+iCE40 FPGAs have 8 global nets. Each global net can be driven directly
+from an IO pin. In the FPGA bitstream, routing of external signals to
+global nets is not controlled by bits in the IO tile. Instead bits that
+do not belong to any tile are used. In IceBox nomenclature such bits are
+called "extra bits".
+
+The following table lists which pins / IO blocks may be used to drive
+which global net, and what .extra statements in the IceStorm ASCII file
+format to represent the corresponding configuration bits:
+
++-----------------+-----------------+-----------------+-----------------+
+| Glb Net         | Pin             | IO Tile +       | IceBox          |
+|                 | (HX1K-TQ144)    | Block #         | Statement       |
++=================+=================+=================+=================+
+| 0               | 93              | 13 8 1          | .extra_bit 0    |
+|                 |                 |                 | 330 142         |
++-----------------+-----------------+-----------------+-----------------+
+| 1               | 21              | 0 8 1           | .extra_bit 0    |
+|                 |                 |                 | 331 142         |
++-----------------+-----------------+-----------------+-----------------+
+| 2               | 128             | 7 17 0          | .extra_bit 1    |
+|                 |                 |                 | 330 143         |
++-----------------+-----------------+-----------------+-----------------+
+| 3               | 50              | 7 0 0           | .extra_bit 1    |
+|                 |                 |                 | 331 143         |
++-----------------+-----------------+-----------------+-----------------+
+| 4               | 20              | 0 9 0           | .extra_bit 1    |
+|                 |                 |                 | 330 142         |
++-----------------+-----------------+-----------------+-----------------+
+| 5               | 94              | 13 9 0          | .extra_bit 1    |
+|                 |                 |                 | 331 142         |
++-----------------+-----------------+-----------------+-----------------+
+| 6               | 49              | 6 0 1           | .extra_bit 0    |
+|                 |                 |                 | 330 143         |
++-----------------+-----------------+-----------------+-----------------+
+| 7               | 129             | 6 17 1          | .extra_bit 0    |
+|                 |                 |                 | 331 143         |
++-----------------+-----------------+-----------------+-----------------+
+
+Signals internal to the FPGA can also be routed to the global nets. This
+is done by routing the signal to the fabout net on an IO tile. The same
+set of I/O tiles is used for this, but in this case each of the I/O
+tiles corresponds to a different global net:
+
+======= === ==== ==== === ==== === === ====
+Glb Net 0   1    2    3   4    5   6   7
+IO Tile 7 0 7 17 13 9 0 9 6 17 6 0 0 8 13 8
+======= === ==== ==== === ==== === === ====
+
+|Column Buffers|
+
+Column Buffer Control Bits
+~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Each LOGIC, IO, and RAMB tile has 8 ColBufCtrl bits, one for each global
+net. In most tiles this bits have no function, but in tiles in rows 4,
+5, 12, and 13 (for RAM columns: rows 3, 5, 11, and 13) this bits control
+which global nets are driven to the column of tiles below and/or above
+that tile (including that tile), as illustrated in the image to the
+right (click to enlarge).
+
+In 8k chips the rows 8, 9, 24, and 25 contain the column buffers. 8k
+RAMB and RAMT tiles can control column buffers, so the pattern looks the
+same for RAM, LOGIC, and IO columns.
+
+Warmboot
+--------
+
+The SB_WARMBOOT primitive in iCE40 FPGAs has three inputs and no
+outputs. The three inputs of that cell are driven by the fabout signal
+from three IO tiles. In HX1K chips the tiles connected to the
+SB_WARMBOOT primitive are:
+
+============ =======
+Warmboot Pin IO Tile
+============ =======
+BOOT         12 0
+S0           13 1
+S1           13 2
+============ =======
+
+PLL Cores
+---------
+
+The PLL primitives in iCE40 FPGAs are configured using the PLLCONFIG\_\*
+bits in the IO tiles. The configuration for a single PLL cell is spread
+out over many IO tiles. For example, the PLL cell in the 1K chip are
+configured as follows (bits listed from LSB to MSB):
+
++-----------------------+-----------------------+-----------------------+
+| IO Tile               | Config Bit            | SB_PLL40\_\*          |
+|                       |                       | Parameter             |
++=======================+=======================+=======================+
+| 0 3                   | PLLCONFIG_5           | Select PLL Type:      |
+|                       |                       | 000 = DISABLED        |
+|                       |                       | 010 = SB_PLL40_PAD    |
+|                       |                       | 100 = SB_PLL40_2_PAD  |
+|                       |                       | 110 = SB_PLL40_2F_PAD |
+|                       |                       | 011 = SB_PLL40_CORE   |
+|                       |                       | 111 =                 |
+|                       |                       | SB_PLL40_2F_CORE      |
++-----------------------+-----------------------+-----------------------+
+| 0 5                   | PLLCONFIG_1           |                       |
++-----------------------+-----------------------+-----------------------+
+| 0 5                   | PLLCONFIG_3           |                       |
++-----------------------+-----------------------+-----------------------+
+| 0 5                   | PLLCONFIG_5           | FEEDBACK_PATH         |
+|                       |                       | 000 = "DELAY"         |
+|                       |                       | 001 = "SIMPLE"        |
+|                       |                       | 010 =                 |
+|                       |                       | "PHASE_AND_DELAY"     |
+|                       |                       | 110 = "EXTERNAL"      |
++-----------------------+-----------------------+-----------------------+
+| 0 2                   | PLLCONFIG_9           |                       |
++-----------------------+-----------------------+-----------------------+
+| 0 3                   | PLLCONFIG_1           |                       |
++-----------------------+-----------------------+-----------------------+
+| 0 4                   | PLLCONFIG_4           | DELAY_ADJ             |
+|                       |                       | USTMENT_MODE_FEEDBACK |
+|                       |                       | 0 = "FIXED"           |
+|                       |                       | 1 = "DYNAMIC"         |
++-----------------------+-----------------------+-----------------------+
+| 0 4                   | PLLCONFIG_9           | DELAY_ADJ             |
+|                       |                       | USTMENT_MODE_RELATIVE |
+|                       |                       | 0 = "FIXED"           |
+|                       |                       | 1 = "DYNAMIC"         |
++-----------------------+-----------------------+-----------------------+
+| 0 3                   | PLLCONFIG_6           | PLLOUT_SELECT         |
+|                       |                       | PLLOUT_SELECT_PORTA   |
+|                       |                       | 00 = "GENCLK"         |
+|                       |                       | 01 = "GENCLK_HALF"    |
+|                       |                       | 10 = "SHIFTREG_90deg" |
+|                       |                       | 11 = "SHIFTREG_0deg"  |
++-----------------------+-----------------------+-----------------------+
+| 0 3                   | PLLCONFIG_7           |                       |
++-----------------------+-----------------------+-----------------------+
+| 0 3                   | PLLCONFIG_2           | PLLOUT_SELECT_PORTB   |
+|                       |                       | 00 = "GENCLK"         |
+|                       |                       | 01 = "GENCLK_HALF"    |
+|                       |                       | 10 = "SHIFTREG_90deg" |
+|                       |                       | 11 = "SHIFTREG_0deg"  |
++-----------------------+-----------------------+-----------------------+
+| 0 3                   | PLLCONFIG_3           |                       |
++-----------------------+-----------------------+-----------------------+
+| 0 3                   | PLLCONFIG_4           | SHIFTREG_DIV_MODE     |
++-----------------------+-----------------------+-----------------------+
+| 0 3                   | PLLCONFIG_8           | TEST_MODE             |
++-----------------------+-----------------------+-----------------------+
+| 0 5                   | PLLCONFIG_2           | Enable ICEGATE for    |
+|                       |                       | PLLOUTGLOBALA         |
++-----------------------+-----------------------+-----------------------+
+| 0 5                   | PLLCONFIG_4           | Enable ICEGATE for    |
+|                       |                       | PLLOUTGLOBALB         |
++-----------------------+-----------------------+-----------------------+
+
+======= =========== ======================
+IO Tile Config Bit  SB_PLL40\_\* Parameter
+======= =========== ======================
+0 3     PLLCONFIG_9 FDA_FEEDBACK
+0 4     PLLCONFIG_1 
+0 4     PLLCONFIG_2 
+0 4     PLLCONFIG_3 
+0 5     PLLCONFIG_5 FDA_RELATIVE
+0 4     PLLCONFIG_6 
+0 4     PLLCONFIG_7 
+0 4     PLLCONFIG_8 
+0 1     PLLCONFIG_1 DIVR
+0 1     PLLCONFIG_2 
+0 1     PLLCONFIG_3 
+0 1     PLLCONFIG_4 
+0 1     PLLCONFIG_5 DIVF
+0 1     PLLCONFIG_6 
+0 1     PLLCONFIG_7 
+0 1     PLLCONFIG_8 
+0 1     PLLCONFIG_9 
+0 2     PLLCONFIG_1 
+0 2     PLLCONFIG_2 
+0 2     PLLCONFIG_3 DIVQ
+0 2     PLLCONFIG_4 
+0 2     PLLCONFIG_5 
+0 2     PLLCONFIG_6 FILTER_RANGE
+0 2     PLLCONFIG_7 
+0 2     PLLCONFIG_8 
+======= =========== ======================
+
+The PLL inputs are routed to the PLL via the fabout signal from various
+IO tiles. The non-clock PLL outputs are routed via otherwise unused
+neigh_op\_\* signals in fabric corners. For example in case of the 1k
+chip:
+
+==== ============== ======================
+Tile Net-Segment    SB_PLL40\_\* Port Name
+==== ============== ======================
+0 1  fabout         REFERENCECLK
+0 2  fabout         EXTFEEDBACK
+0 4  fabout         DYNAMICDELAY
+0 5  fabout         
+0 6  fabout         
+0 10 fabout         
+0 11 fabout         
+0 12 fabout         
+0 13 fabout         
+0 14 fabout         
+1 1  neigh_op_bnl_1 LOCK
+1 0  fabout         BYPASS
+2 0  fabout         RESETB
+5 0  fabout         LATCHINPUTVALUE
+12 1 neigh_op_bnr_3 SDO
+4 0  fabout         SDI
+3 0  fabout         SCLK
+==== ============== ======================
+
+The PLL clock outputs are fed directly into the input path of certain IO
+tiles. In case of the 1k chip the PORTA clock is fed into PIO 1 of IO
+Tile (6 0) and the PORTB clock is fed into PIO 0 of IO Tile (7 0).
+Because of this, those two PIOs can only be used as output Pins by the
+FPGA fabric when the PLL ports are being used.
+
+The input path that are stolen are also used to implement the ICEGATE
+function. If the input pin type of the input path being stolen is set to
+PIN_INPUT_LATCH, then the ICEGATE function is enabled for the
+corresponding CORE output of the PLL.
+
+.. |IO Tile Span-Wires| image:: _static/images/iosp.svg
+   :height: 200px
+   :target: iosp.svg
+.. |Column Buffers| image:: _static/images/colbuf.svg
+   :height: 200px
+   :target: colbuf.svg
diff --git a/docs/source/logic_tile.rst b/docs/source/logic_tile.rst
new file mode 100644
index 0000000..9a6f23c
--- /dev/null
+++ b/docs/source/logic_tile.rst
@@ -0,0 +1,327 @@
+LOGIC Tile Documentation
+========================
+
+Span-4 and Span-12 Wires
+------------------------
+
+The *span-4* and *span-12* wires are the main interconnect resource in
+iCE40 FPGAs. They "span" (have a length of) 4 or 12 cells in horizontal
+or vertical direction.
+
+All routing resources in iCE40 are directional tristate buffers. The
+bits marked routing use the all-zeros config pattern for tristate, while
+the bits marked buffer have a dedicated buffer-enable bit, which is 1 in
+all non-tristate configurations.
+
+Span-4 Horizontal
+~~~~~~~~~~~~~~~~~
+
+|Span-4 Horizontal|
+
+The image on the right shows the *horizontal span-4* wires of a logic or
+ram cell (click to enlarge).
+
+On the left side of the cell there are 48 connections named sp4_h_l_0 to
+sp4_h_l_47. The lower 36 of those wires are connected to sp4_h_r_12 to
+sp4_h_r_47 on the right side of the cell. (IceStorm normalizes this wire
+names to sp4_h_r_0 to sp4_h_r_35. Note: the Lattice tools use a
+different normalization scheme for this wire names.) The wires
+connecting the left and right horizontal span-4 ports are pairwise
+crossed-out.
+
+The wires sp4_h_l_36 to sp4_h_l_47 terminate in the cell as do the wires
+sp4_h_r_0 to sp4_h_r_11.
+
+This wires "span" 4 cells, i.e. they connect 5 cells if you count the
+cells on both ends of the wire.
+
+For example, the wire sp4_h_r_0 in cell (x, y) has the following names:
+
+================ ===================== =====================
+Cell Coordinates sp4_h_l\_\* wire name sp4_h_r\_\* wire name
+================ ===================== =====================
+x, y             --                    sp4_h_r_0
+x+1, y           sp4_h_l_0             sp4_h_r_13
+x+2, y           sp4_h_l_13            sp4_h_r_24
+x+3, y           sp4_h_l_24            sp4_h_r_37
+x+4, y           sp4_h_l_37            --
+================ ===================== =====================
+
+Span-4 Vertical
+~~~~~~~~~~~~~~~
+
+|Span-4 Vertical|
+
+The image on the right shows the *vertical span-4* wires of a logic or
+ram cell (click to enlarge).
+
+Similar to the horizontal span-4 wires there are 48 connections on the
+top (sp4_v_t_0 to sp4_v_t_47) and 48 connections on the bottom
+(sp4_v_b_0 to sp4_v_b_47). The wires sp4_v_t_0 to sp4_v_t_35 are
+connected to sp4_v_b_12 to sp4_v_b_47 (with pairwise crossing out). Wire
+names are normalized to sp4_v_b_12 to sp4_v_b_47.
+
+But in addition to that, each cell also has access to sp4_v_b_0 to
+sp4_v_b_47 of its right neighbour. This are the wires sp4_r_v_b_0 to
+sp4_r_v_b_47. So over all a single vertical span-4 wire connects 9
+cells. For example, the wire sp4_v_b_0 in cell (x, y) has the following
+names:
+
++----------------+----------------+----------------+----------------+
+| Cell           | sp4_v_t\_\*    | sp4_v_b\_\*    | sp4_r_v_b\_\*  |
+| Coordinates    | wire name      | wire name      | wire name      |
++================+================+================+================+
+| x, y           | --             | sp4_v_b_0      | --             |
++----------------+----------------+----------------+----------------+
+| x, y-1         | sp4_v_t_0      | sp4_v_b_13     | --             |
++----------------+----------------+----------------+----------------+
+| x, y-2         | sp4_v_t_13     | sp4_v_b_24     | --             |
++----------------+----------------+----------------+----------------+
+| x, y-3         | sp4_v_t_24     | sp4_v_b_37     | --             |
++----------------+----------------+----------------+----------------+
+| x, y-4         | sp4_v_t_37     | --             | --             |
++----------------+----------------+----------------+----------------+
+| x-1, y         | --             | --             | sp4_r_v_b_0    |
++----------------+----------------+----------------+----------------+
+| x-1, y-1       | --             | --             | sp4_r_v_b_13   |
++----------------+----------------+----------------+----------------+
+| x-1, y-2       | --             | --             | sp4_r_v_b_24   |
++----------------+----------------+----------------+----------------+
+| x-1, y-3       | --             | --             | sp4_r_v_b_37   |
++----------------+----------------+----------------+----------------+
+
+Span-12 Horizontal and Vertical
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Similar to the span-4 wires there are also longer horizontal and
+vertical span-12 wires.
+
+There are 24 connections sp12_v_t_0 to sp12_v_t_23 on the top of the
+cell and 24 connections sp12_v_b_0 to sp12_v_b_23 on the bottom of the
+cell. The wires sp12_v_t_0 to sp12_v_t_21 are connected to sp12_v_b_2 to
+sp12_v_b_23 (with pairwise crossing out). The connections sp12_v_b_0,
+sp12_v_b_1, sp12_v_t_22, and sp12_v_t_23 terminate in the cell. Wire
+names are normalized to sp12_v_b_2 to sp12_v_b_23.
+
+There are also 24 connections sp12_h_l_0 to sp12_h_l_23 on the left of
+the cell and 24 connections sp12_h_r_0 to sp12_h_r_23 on the right of
+the cell. The wires sp12_h_l_0 to sp12_h_l_21 are connected to
+sp12_h_r_2 to sp12_h_r_23 (with pairwise crossing out). The connections
+sp12_h_r_0, sp12_h_r_1, sp12_h_l_22, and sp12_h_l_23 terminate in the
+cell. Wire names are normalized to sp12_v_r_2 to sp12_h_r_23.
+
+Local Tracks
+------------
+
+The *local tracks* are the gateway to the logic cell inputs. Signals
+from the span-wires and the logic cell outputs of the eight neighbour
+cells can be routed to the local tracks and signals from the local
+tracks can be routed to the logic cell inputs.
+
+Each logic tile has 32 local tracks. They are organized in 4 groups of 8
+wires each: local_g0_0 to local_g3_7.
+
+The span wires, global signals, and neighbour outputs can be routed to
+the local tracks. But not all of those signals can be routed to all of
+the local tracks. Instead there is a different mix of 16 signals for
+each local track.
+
+The buffer driving the local track has 5 configuration bits. One enable
+bit and 4 bits that select the input wire. For example for local_g0_0
+(copy&paste from the bitstream doku):
+
++--------+--------+--------+--------+--------+----------+----------------+-----------------+
+| B0[14] | B1[14] | B1[15] | B1[16] | B1[17] | Function | Source-Net     | Destination-Net |
++========+========+========+========+========+==========+================+=================+
+| 0      | 0      | 0      | 0      | 1      | buffer   | sp4_r_v_b_24   | local_g0_0      |
++--------+--------+--------+--------+--------+----------+----------------+-----------------+
+| 0      | 0      | 0      | 1      | 1      | buffer   | sp12_h_r_8     | local_g0_0      |
++--------+--------+--------+--------+--------+----------+----------------+-----------------+
+| 0      | 0      | 1      | 0      | 1      | buffer   | neigh_op_bot_0 | local_g0_0      |
++--------+--------+--------+--------+--------+----------+----------------+-----------------+
+| 0      | 0      | 1      | 1      | 1      | buffer   | sp4_v_b_16     | local_g0_0      |
++--------+--------+--------+--------+--------+----------+----------------+-----------------+
+| 0      | 1      | 0      | 0      | 1      | buffer   | sp4_r_v_b_35   | local_g0_0      |
++--------+--------+--------+--------+--------+----------+----------------+-----------------+
+| 0      | 1      | 0      | 1      | 1      | buffer   | sp12_h_r_16    | local_g0_0      |
++--------+--------+--------+--------+--------+----------+----------------+-----------------+
+| 0      | 1      | 1      | 0      | 1      | buffer   | neigh_op_top_0 | local_g0_0      |
++--------+--------+--------+--------+--------+----------+----------------+-----------------+
+| 0      | 1      | 1      | 1      | 1      | buffer   | sp4_h_r_0      | local_g0_0      |
++--------+--------+--------+--------+--------+----------+----------------+-----------------+
+| 1      | 0      | 0      | 0      | 1      | buffer   | lutff_0/out    | local_g0_0      |
++--------+--------+--------+--------+--------+----------+----------------+-----------------+
+| 1      | 0      | 0      | 1      | 1      | buffer   | sp4_v_b_0      | local_g0_0      |
++--------+--------+--------+--------+--------+----------+----------------+-----------------+
+| 1      | 0      | 1      | 0      | 1      | buffer   | neigh_op_lft_0 | local_g0_0      |
++--------+--------+--------+--------+--------+----------+----------------+-----------------+
+| 1      | 0      | 1      | 1      | 1      | buffer   | sp4_h_r_8      | local_g0_0      |
++--------+--------+--------+--------+--------+----------+----------------+-----------------+
+| 1      | 1      | 0      | 0      | 1      | buffer   | neigh_op_bnr_0 | local_g0_0      |
++--------+--------+--------+--------+--------+----------+----------------+-----------------+
+| 1      | 1      | 0      | 1      | 1      | buffer   | sp4_v_b_8      | local_g0_0      |
++--------+--------+--------+--------+--------+----------+----------------+-----------------+
+| 1      | 1      | 1      | 0      | 1      | buffer   | sp12_h_r_0     | local_g0_0      |
++--------+--------+--------+--------+--------+----------+----------------+-----------------+
+| 1      | 1      | 1      | 1      | 1      | buffer   | sp4_h_r_16     | local_g0_0      |
++--------+--------+--------+--------+--------+----------+----------------+-----------------+
+
+Then the signals on the local tracks can be routed to the input pins of
+the logic cells. Like before, not every local track can be routed to
+every logic cell input pin. Instead there is a different mix of 16 local
+track for each logic cell input. For example for lutff_0/in_0:
+
+====== ====== ====== ====== ====== ======== ========== ===============
+B0[26] B1[26] B1[27] B1[28] B1[29] Function Source-Net Destination-Net
+====== ====== ====== ====== ====== ======== ========== ===============
+0      0      0      0      1      buffer   local_g0_0 lutff_0/in_0
+0      0      0      1      1      buffer   local_g2_0 lutff_0/in_0
+0      0      1      0      1      buffer   local_g1_1 lutff_0/in_0
+0      0      1      1      1      buffer   local_g3_1 lutff_0/in_0
+0      1      0      0      1      buffer   local_g0_2 lutff_0/in_0
+0      1      0      1      1      buffer   local_g2_2 lutff_0/in_0
+0      1      1      0      1      buffer   local_g1_3 lutff_0/in_0
+0      1      1      1      1      buffer   local_g3_3 lutff_0/in_0
+1      0      0      0      1      buffer   local_g0_4 lutff_0/in_0
+1      0      0      1      1      buffer   local_g2_4 lutff_0/in_0
+1      0      1      0      1      buffer   local_g1_5 lutff_0/in_0
+1      0      1      1      1      buffer   local_g3_5 lutff_0/in_0
+1      1      0      0      1      buffer   local_g0_6 lutff_0/in_0
+1      1      0      1      1      buffer   local_g2_6 lutff_0/in_0
+1      1      1      0      1      buffer   local_g1_7 lutff_0/in_0
+1      1      1      1      1      buffer   local_g3_7 lutff_0/in_0
+====== ====== ====== ====== ====== ======== ========== ===============
+
+The 8 global nets on the iCE40 can be routed to the local track via the
+glb2local_0 to glb2local_3 nets using a similar two-stage process. The
+logic block clock-enable and set-reset inputs can be driven directly
+from one of 4 global nets or from one of 4 local tracks. The logic block
+clock input can be driven from any of the global nets and from a few
+local tracks. See the bitstream documentation for details.
+
+Logic Block
+-----------
+
+Each logic tile has a logic block containing 8 logic cells. Each logic
+cell contains a 4-input LUT, a carry unit and a flip-flop. Clock, clock
+enable, and set/reset inputs are shared along the 8 logic cells. So is
+the bit that configures positive/negative edge for the flip flops. But
+the three configuration bits that specify if the flip flop should be
+used, if it is set or reset by the set/reset input, and if the set/reset
+is synchronous or asynchronous exist for each logic cell individually.
+
+Each LUT *i* has four input wires lutff\_\ i/in_0 to lutff\_\ i/in_3.
+Input lutff\_\ i/in_3 can be configured to be driven by the carry output
+of the previous logic cell, or by carry_in_mux in case of *i*\ =0. Input
+lutff\_\ i/in_2 can be configured to be driven by the output of the
+previous LUT for *i*>0 (LUT cascade). The LUT uses its 4 input signals
+to calculate lutff\_\ i/lout. The signal is then passed through the
+built-in FF and becomes lutff\_\ i/out. With the exception of LUT
+cascades, only the signal after the FF is visible from outside the logic
+block.
+
+The carry unit calculates lutff\_\ i/cout = lutff\_\ i/in_1 +
+lutff\_\ i/in_2 + lutff\_\ (i-1)/cout > 1. In case of *i*\ =0,
+carry_in_mux is used as third input. carry_in_mux can be configured to
+be constant 0, 1 or the lutff_7/cout signal from the logic tile below.
+
+Part of the functionality described above is documented as part of the
+routing bitstream documentation (see the buffers for lutff\_ inputs).
+The NegClk bit switches all 8 FFs in the tile to negative edge mode. The
+CarryInSet bit drives the carry_in_mux high (it defaults to low when not
+driven via the buffer from carry_in).
+
+The remaining functions of the logic cell are configured via the LC\_\ i
+bits. This are 20 bit per logic cell. We have arbitrarily labeled those
+bits as follows:
+
++-----------------+--------+--------+--------+--------+--------+---------+---------+---------+
+| Label           | LC_0   | LC_1   | LC_2   | LC_3   | LC_4   | LC_5    | LC_6    | LC_7    |
++=================+========+========+========+========+========+=========+=========+=========+
+| LC\_\ *i*\ [0]  | B0[36] | B2[36] | B4[36] | B6[36] | B8[36] | B10[36] | B12[36] | B14[36] |
++-----------------+--------+--------+--------+--------+--------+---------+---------+---------+
+| LC\_\ *i*\ [1]  | B0[37] | B2[37] | B4[37] | B6[37] | B8[37] | B10[37] | B12[37] | B14[37] |
++-----------------+--------+--------+--------+--------+--------+---------+---------+---------+
+| LC\_\ *i*\ [2]  | B0[38] | B2[38] | B4[38] | B6[38] | B8[38] | B10[38] | B12[38] | B14[38] |
++-----------------+--------+--------+--------+--------+--------+---------+---------+---------+
+| LC\_\ *i*\ [3]  | B0[39] | B2[39] | B4[39] | B6[39] | B8[39] | B10[39] | B12[39] | B14[39] |
++-----------------+--------+--------+--------+--------+--------+---------+---------+---------+
+| LC\_\ *i*\ [4]  | B0[40] | B2[40] | B4[40] | B6[40] | B8[40] | B10[40] | B12[40] | B14[40] |
++-----------------+--------+--------+--------+--------+--------+---------+---------+---------+
+| LC\_\ *i*\ [5]  | B0[41] | B2[41] | B4[41] | B6[41] | B8[41] | B10[41] | B12[41] | B14[41] |
++-----------------+--------+--------+--------+--------+--------+---------+---------+---------+
+| LC\_\ *i*\ [6]  | B0[42] | B2[42] | B4[42] | B6[42] | B8[42] | B10[42] | B12[42] | B14[42] |
++-----------------+--------+--------+--------+--------+--------+---------+---------+---------+
+| LC\_\ *i*\ [7]  | B0[43] | B2[43] | B4[43] | B6[43] | B8[43] | B10[43] | B12[43] | B14[43] |
++-----------------+--------+--------+--------+--------+--------+---------+---------+---------+
+| LC\_\ *i*\ [8]  | B0[44] | B2[44] | B4[44] | B6[44] | B8[44] | B10[44] | B12[44] | B14[44] |
++-----------------+--------+--------+--------+--------+--------+---------+---------+---------+
+| LC\_\ *i*\ [9]  | B0[45] | B2[45] | B4[45] | B6[45] | B8[45] | B10[45] | B12[45] | B14[45] |
++-----------------+--------+--------+--------+--------+--------+---------+---------+---------+
+| LC\_\ *i*\ [10] | B1[36] | B3[36] | B5[36] | B7[36] | B9[36] | B11[36] | B13[36] | B15[36] |
++-----------------+--------+--------+--------+--------+--------+---------+---------+---------+
+| LC\_\ *i*\ [11] | B1[37] | B3[37] | B5[37] | B7[37] | B9[37] | B11[37] | B13[37] | B15[37] |
++-----------------+--------+--------+--------+--------+--------+---------+---------+---------+
+| LC\_\ *i*\ [12] | B1[38] | B3[38] | B5[38] | B7[38] | B9[38] | B11[38] | B13[38] | B15[38] |
++-----------------+--------+--------+--------+--------+--------+---------+---------+---------+
+| LC\_\ *i*\ [13] | B1[39] | B3[39] | B5[39] | B7[39] | B9[39] | B11[39] | B13[39] | B15[39] |
++-----------------+--------+--------+--------+--------+--------+---------+---------+---------+
+| LC\_\ *i*\ [14] | B1[40] | B3[40] | B5[40] | B7[40] | B9[40] | B11[40] | B13[40] | B15[40] |
++-----------------+--------+--------+--------+--------+--------+---------+---------+---------+
+| LC\_\ *i*\ [15] | B1[41] | B3[41] | B5[41] | B7[41] | B9[41] | B11[41] | B13[41] | B15[41] |
++-----------------+--------+--------+--------+--------+--------+---------+---------+---------+
+| LC\_\ *i*\ [16] | B1[42] | B3[42] | B5[42] | B7[42] | B9[42] | B11[42] | B13[42] | B15[42] |
++-----------------+--------+--------+--------+--------+--------+---------+---------+---------+
+| LC\_\ *i*\ [17] | B1[43] | B3[43] | B5[43] | B7[43] | B9[43] | B11[43] | B13[43] | B15[43] |
++-----------------+--------+--------+--------+--------+--------+---------+---------+---------+
+| LC\_\ *i*\ [18] | B1[44] | B3[44] | B5[44] | B7[44] | B9[44] | B11[44] | B13[44] | B15[44] |
++-----------------+--------+--------+--------+--------+--------+---------+---------+---------+
+| LC\_\ *i*\ [19] | B1[45] | B3[45] | B5[45] | B7[45] | B9[45] | B11[45] | B13[45] | B15[45] |
++-----------------+--------+--------+--------+--------+--------+---------+---------+---------+
+
+LC\_\ i\ [8] is the CarryEnable bit. This bit must be set if the carry
+logic is used.
+
+LC\_\ i\ [9] is the DffEnable bit. It enables the output flip-flop for
+the LUT.
+
+LC\_\ i\ [18] is the Set_NoReset bit. When this bit is set then the
+set/reset signal will set, not reset the flip-flop.
+
+LC\_\ i\ [19] is the AsyncSetReset bit. When this bit is set then the
+set/reset signal is asynchronous to the clock.
+
+The LUT implements the following truth table:
+
+==== ==== ==== ==== =============
+in_3 in_2 in_1 in_0 lout
+==== ==== ==== ==== =============
+0    0    0    0    LC\_\ i\ [4]
+0    0    0    1    LC\_\ i\ [14]
+0    0    1    0    LC\_\ i\ [15]
+0    0    1    1    LC\_\ i\ [5]
+0    1    0    0    LC\_\ i\ [6]
+0    1    0    1    LC\_\ i\ [16]
+0    1    1    0    LC\_\ i\ [17]
+0    1    1    1    LC\_\ i\ [7]
+1    0    0    0    LC\_\ i\ [3]
+1    0    0    1    LC\_\ i\ [13]
+1    0    1    0    LC\_\ i\ [12]
+1    0    1    1    LC\_\ i\ [2]
+1    1    0    0    LC\_\ i\ [1]
+1    1    0    1    LC\_\ i\ [11]
+1    1    1    0    LC\_\ i\ [10]
+1    1    1    1    LC\_\ i\ [0]
+==== ==== ==== ==== =============
+
+LUT inputs that are not connected to anything are driven low. The
+set/reset signal is also driven low if not connected to any other
+driver, and the clock enable signal is driven high when left
+unconnected.
+
+.. |Span-4 Horizontal| image:: _static/images/sp4h.svg
+   :height: 200px
+   :target: sp4h.svg
+.. |Span-4 Vertical| image:: _static/images/sp4v.svg
+   :height: 200px
+   :target: sp4v.svg
diff --git a/docs/source/notes_osx.rst b/docs/source/notes_osx.rst
new file mode 100644
index 0000000..dbc2f33
--- /dev/null
+++ b/docs/source/notes_osx.rst
@@ -0,0 +1,72 @@
+Notes for Installing on OSX
+===========================
+
+The toolchain should be easy to install on OSX platforms. Below are a
+few troubleshooting items found on Mountain Lion (10.8.2).
+
+See https://github.com/ddm/icetools for a set of shell scripts to build
+IceStorm on OSX (using brew for dependencies).
+
+Installing FTDI Library
+-----------------------
+
+The libftdi package (.so lib binary and the ftdi.h header) has been
+renamed to libftdi0, so either do:
+
+| ``port install libftdi0``
+| (note that ports installs the tool to /opt instead of /usr, see
+   next note)
+
+``brew install libftdi0``
+
+iceprog make error on "ftdi.h not found"
+----------------------------------------
+
+Note that Mac Ports installs to /opt instead of /usr, so change the
+first two lines in ``iceprog/Makefile`` to:
+
+::
+
+   LDLIBS = -L/usr/local/lib -L/opt/local/lib -lftdi -lm
+   CFLAGS = -MD -O0 -ggdb -Wall -std=c99 -I/usr/local/include -I/opt/local/include/
+
+Basically you are indicating where to find the lib with
+``-L/opt/local/lib`` and where to find the .h with
+``-I/opt/local/include/``.
+
+yosys make error on "<tuple> not found"
+---------------------------------------
+
+This is a compiler issue, i.e., you are probably running on clang and
+you can circumvent this error by compiling against another compiler.
+Edit the Makefile of yosys and replace the two first lines for this,
+i.e., comment the first line (clang) and uncomment the second (gcc):
+
+::
+
+   #CONFIG := clang
+   CONFIG := gcc
+
+error "Can't find iCE FTDI USB device (vendor_id 0x0403, device_id 0x6010)." while uploading code to FPGA (e.g., "iceprog example.bin")
+---------------------------------------------------------------------------------------------------------------------------------------
+
+You need to unload the FTDI driver (notes below are from Mountain Lion,
+10.8.2). First check if it is running:
+
+::
+
+   kextstat | grep FTDIUSBSerialDriver
+
+If you see it on the kextstat, we need to unload it:
+
+::
+
+   sudo kextunload -b com.FTDI.driver.FTDIUSBSerialDriver
+
+Repeat the ``kextstat`` command and check that the driver was
+successfully unloaded.
+
+Try running ``iceprog example.bin`` again. It should be working now.
+
+Note: On newer OSes perhaps you need to also kextunload the
+``com.apple.driver.AppleUSBFTDI`` driver.
diff --git a/docs/source/overview.rst b/docs/source/overview.rst
new file mode 100644
index 0000000..40dab79
--- /dev/null
+++ b/docs/source/overview.rst
@@ -0,0 +1,740 @@
+Project IceStorm
+================
+
+| **2018-01-30:** Released support for iCE40 UltraPlus devices.
+| **2017-03-13:** Released support for LP384 chips (in all package
+  variants).
+| **2016-02-07:** Support for all package variants of LP1K, LP4K, LP8K
+  and HX1K, HX4K, and HX8K.
+| **2016-01-17:** First release of IceTime timing analysis. Video:
+  https://youtu.be/IG5CpFJRnOk
+| **2015-12-27:**
+  `Presentation <http://bygone.clairexen.net/papers/2015/icestorm-flow/>`__
+  of the IceStorm flow at 32C3 (`Video on
+  Youtube <https://www.youtube.com/watch?v=SOn0g3k0FlE>`__).
+| **2015-07-19:** Released support for 8k chips. Moved IceStorm source
+  code to GitHub.
+| **2015-05-27:** We have a working fully Open Source flow with
+  `Yosys <http://bygone.clairexen.net/yosys/>`__ and
+  `Arachne-pnr <https://github.com/cseed/arachne-pnr>`__! Video:
+  http://youtu.be/yUiNlmvVOq8
+| **2015-04-13:** Complete rewrite of IceUnpack, added IcePack, some
+  major documentation updates
+| **2015-03-22:** First public release and short YouTube video
+  demonstrating our work: http://youtu.be/u1ZHcSNDQMM
+
+What is Project IceStorm?
+-------------------------
+
+Project IceStorm aims at documenting the bitstream format of Lattice
+iCE40 FPGAs and providing simple tools for analyzing and creating
+bitstream files. The IceStorm flow
+(`Yosys <http://bygone.clairexen.net/yosys/>`__,
+`Arachne-pnr <https://github.com/cseed/arachne-pnr>`__, and IceStorm) is
+a fully open source Verilog-to-Bitstream flow for iCE40 FPGAs.
+
+The focus of the project is on the iCE40 LP/HX 1K/4K/8K chips. (Most of
+the work was done on HX1K-TQ144 and HX8K-CT256 parts.) The iCE40
+UltraPlus parts are also supported, including DSPs, oscillators, RGB and
+SPRAM. iCE40 LM, Ultra and UltraLite parts are not yet supported.
+
+Why the Lattice iCE40?
+----------------------
+
+It has a very minimalistic architecture with a very regular structure.
+There are not many different kinds of tiles or special function units.
+This makes it both ideal for creating bitstream documentations and as a
+reference platform for general purpose FPGA tool development.
+
+Also, with the `Lattice
+iCEstick <http://www.latticesemi.com/icestick>`__ there is a cheap and
+easy to use development platform available, which makes the part
+interesting for all kinds of projects. (The iCEstick features an HX1K
+device. Lattice also sells an `iCE40-HX8K Breakout
+Board <http://www.latticesemi.com/en/Products/DevelopmentBoardsAndKits/iCE40HX8KBreakoutBoard.aspx>`__
+featuring an HX8K chip.)
+
+What is the Status of the Project?
+----------------------------------
+
+We are pretty confident that we have the 1K and 8K devices completely
+documented. For example, it seems we can create correct functional
+Verilog models for all bitstreams generated by Lattice iCEcube2 for the
+iCE40 HX1K-TQ144 and the iCE40 HX8K-CT256 using our ``icebox_vlog``
+tool.
+
+Here is a list of currently supported parts and the corresponding
+options for arachne-pnr (place and route) and icetime (timing analysis):
+
++---------+---------+---------+------+---------+---------+---------+
+| Part    | Package | Pin     | I/Os | nextpnr | arac    | icetime |
+|         |         | Spacing |      | opts    | hne-pnr | opts    |
+|         |         |         |      |         | opts    |         |
++=========+=========+=========+======+=========+=========+=========+
+| iCE4    | 16-ball | 0.35 mm | 10   | --lp1k  | -d 1k   | -d lp1k |
+| 0-LP1K- | WLCSP   |         |      | --      | -P      |         |
+| SWG16TR | (1.40 x |         |      | package | swg16tr |         |
+|         | 1.48    |         |      | swg16tr |         |         |
+|         | mm)     |         |      |         |         |         |
++---------+---------+---------+------+---------+---------+---------+
+| iC      | 30-ball | 0.40 mm | 21   | --up5k  | -d 5k   | -d up5k |
+| E40-UP3 | WLCSP   |         |      | --      | -P      |         |
+| K-UWG30 | (2.15 x |         |      | package | uwg30   |         |
+|         | 2.55    |         |      | uwg30   |         |         |
+|         | mm)     |         |      |         |         |         |
++---------+---------+---------+------+---------+---------+---------+
+| iC      | 30-ball | 0.40 mm | 21   | --up5k  | -d 5k   | -d up5k |
+| E40-UP5 | WLCSP   |         |      | --      | -P      |         |
+| K-UWG30 | (2.15 x |         |      | package | uwg30   |         |
+|         | 2.55    |         |      | uwg30   |         |         |
+|         | mm)     |         |      |         |         |         |
++---------+---------+---------+------+---------+---------+---------+
+| iC      | 36-ball | 0.40 mm | 25   | --lp384 | -d 384  | -d      |
+| E40-LP3 | ucBGA   |         |      | --      | -P cm36 | lp384   |
+| 84-CM36 | (2.5 x  |         |      | package |         |         |
+|         | 2.5 mm) |         |      | cm36    |         |         |
++---------+---------+---------+------+---------+---------+---------+
+| i       | 36-ball | 0.40 mm | 25   | --lp1k  | -d 1k   | -d lp1k |
+| CE40-LP | ucBGA   |         |      | --      | -P cm36 |         |
+| 1K-CM36 | (2.5 x  |         |      | package |         |         |
+|         | 2.5 mm) |         |      | cm36    |         |         |
++---------+---------+---------+------+---------+---------+---------+
+| iC      | 49-ball | 0.40 mm | 37   | --lp384 | -d 384  | -d      |
+| E40-LP3 | ucBGA   |         |      | --      | -P cm49 | lp384   |
+| 84-CM49 | (3 x 3  |         |      | package |         |         |
+|         | mm)     |         |      | cm49    |         |         |
++---------+---------+---------+------+---------+---------+---------+
+| i       | 49-ball | 0.40 mm | 35   | --lp1k  | -d 1k   | -d lp1k |
+| CE40-LP | ucBGA   |         |      | --      | -P cm49 |         |
+| 1K-CM49 | (3 x 3  |         |      | package |         |         |
+|         | mm)     |         |      | cm49    |         |         |
++---------+---------+---------+------+---------+---------+---------+
+| i       | 81-ball | 0.40 mm | 63   | --lp1k  | -d 1k   | -d lp1k |
+| CE40-LP | ucBGA   |         |      | --      | -P cm81 |         |
+| 1K-CM81 | (4 x 4  |         |      | package |         |         |
+|         | mm)     |         |      | cm81    |         |         |
++---------+---------+---------+------+---------+---------+---------+
+| i       | 81-ball | 0.40 mm | 63   | --lp8k  | -d 8k   | -d lp8k |
+| CE40-LP | ucBGA   |         |      | --      | -P      |         |
+| 4K-CM81 | (4 x 4  |         |      | package | cm81:4k |         |
+|         | mm)     |         |      | cm81:4k |         |         |
++---------+---------+---------+------+---------+---------+---------+
+| i       | 81-ball | 0.40 mm | 63   | --lp9k  | -d 8k   | -d lp8k |
+| CE40-LP | ucBGA   |         |      | --      | -P cm81 |         |
+| 8K-CM81 | (4 x 4  |         |      | package |         |         |
+|         | mm)     |         |      | cm81    |         |         |
++---------+---------+---------+------+---------+---------+---------+
+| iC      | 1       | 0.40 mm | 95   | --lp1k  | -d 1k   | -d lp1k |
+| E40-LP1 | 21-ball |         |      | --      | -P      |         |
+| K-CM121 | ucBGA   |         |      | package | cm121   |         |
+|         | (5 x 5  |         |      | cm121   |         |         |
+|         | mm)     |         |      |         |         |         |
++---------+---------+---------+------+---------+---------+---------+
+| iC      | 1       | 0.40 mm | 93   | --lp8k  | -d 8k   | -d lp8k |
+| E40-LP4 | 21-ball |         |      | --      | -P      |         |
+| K-CM121 | ucBGA   |         |      | package | c       |         |
+|         | (5 x 5  |         |      | c       | m121:4k |         |
+|         | mm)     |         |      | m121:4k |         |         |
++---------+---------+---------+------+---------+---------+---------+
+| iC      | 1       | 0.40 mm | 93   | --lp8k  | -d 8k   | -d lp8k |
+| E40-LP8 | 21-ball |         |      | --      | -P      |         |
+| K-CM121 | ucBGA   |         |      | package | cm121   |         |
+|         | (5 x 5  |         |      | cm121   |         |         |
+|         | mm)     |         |      |         |         |         |
++---------+---------+---------+------+---------+---------+---------+
+| iC      | 2       | 0.40 mm | 167  | --lp8k  | -d 8k   | -d lp8k |
+| E40-LP4 | 25-ball |         |      | --      | -P      |         |
+| K-CM225 | ucBGA   |         |      | package | c       |         |
+|         | (7 x 7  |         |      | c       | m225:4k |         |
+|         | mm)     |         |      | m225:4k |         |         |
++---------+---------+---------+------+---------+---------+---------+
+| iC      | 2       | 0.40 mm | 178  | --lp8k  | -d 8k   | -d lp8k |
+| E40-LP8 | 25-ball |         |      | --      | -P      |         |
+| K-CM225 | ucBGA   |         |      | package | cm225   |         |
+|         | (7 x 7  |         |      | cm225   |         |         |
+|         | mm)     |         |      |         |         |         |
++---------+---------+---------+------+---------+---------+---------+
+| iC      | 2       | 0.40 mm | 178  | --hx8k  | -d 8k   | -d hx8k |
+| E40-HX8 | 25-ball |         |      | --      | -P      |         |
+| K-CM225 | ucBGA   |         |      | package | cm225   |         |
+|         | (7 x 7  |         |      | cm225   |         |         |
+|         | mm)     |         |      |         |         |         |
++---------+---------+---------+------+---------+---------+---------+
+| iC      | 32-pin  | 0.50 mm | 21   | --lp384 | -d 384  | -d      |
+| E40-LP3 | QFN (5  |         |      | --      | -P qn32 | lp384   |
+| 84-QN32 | x 5 mm) |         |      | package |         |         |
+|         |         |         |      | qn32    |         |         |
++---------+---------+---------+------+---------+---------+---------+
+| i       | 48-pin  | 0.50 mm | 39   | --up5k  | -d 5k   | -d up5k |
+| CE40-UP | QFN (7  |         |      | --      | -P sg48 |         |
+| 5K-SG48 | x 7 mm) |         |      | package |         |         |
+|         |         |         |      | sg48    |         |         |
++---------+---------+---------+------+---------+---------+---------+
+| i       | 84-pin  | 0.50 mm | 67   | --lp1k  | -d 1k   | -d lp1k |
+| CE40-LP | QFNS (7 |         |      | --      | -P qn84 |         |
+| 1K-QN84 | x 7 mm) |         |      | package |         |         |
+|         |         |         |      | qn84    |         |         |
++---------+---------+---------+------+---------+---------+---------+
+| i       | 81-ball | 0.50 mm | 62   | --lp1k  | -d 1k   | -d lp1k |
+| CE40-LP | csBGA   |         |      | --      | -P cb81 |         |
+| 1K-CB81 | (5 x 5  |         |      | package |         |         |
+|         | mm)     |         |      | cb81    |         |         |
++---------+---------+---------+------+---------+---------+---------+
+| iC      | 1       | 0.50 mm | 92   | --lp1k  | -d 1k   | -d lp1k |
+| E40-LP1 | 21-ball |         |      | --      | -P      |         |
+| K-CB121 | csBGA   |         |      | package | cb121   |         |
+|         | (6 x 6  |         |      | cb121   |         |         |
+|         | mm)     |         |      |         |         |         |
++---------+---------+---------+------+---------+---------+---------+
+| iC      | 1       | 0.50 mm | 95   | --hx1k  | -d 1k   | -d hx1k |
+| E40-HX1 | 32-ball |         |      | --      | -P      |         |
+| K-CB132 | csBGA   |         |      | package | cb132   |         |
+|         | (8 x 8  |         |      | cb132   |         |         |
+|         | mm)     |         |      |         |         |         |
++---------+---------+---------+------+---------+---------+---------+
+| iC      | 1       | 0.50 mm | 95   | --hx8k  | -d 8k   | -d hx8k |
+| E40-HX4 | 32-ball |         |      | --      | -P      |         |
+| K-CB132 | csBGA   |         |      | package | c       |         |
+|         | (8 x 8  |         |      | c       | b132:4k |         |
+|         | mm)     |         |      | b132:4k |         |         |
++---------+---------+---------+------+---------+---------+---------+
+| iC      | 1       | 0.50 mm | 95   | --hx8k  | -d 8k   | -d hx8k |
+| E40-HX8 | 32-ball |         |      | --      | -P      |         |
+| K-CB132 | csBGA   |         |      | package | cb132   |         |
+|         | (8 x 8  |         |      | cb132   |         |         |
+|         | mm)     |         |      |         |         |         |
++---------+---------+---------+------+---------+---------+---------+
+| iC      | 100-pin | 0.50 mm | 72   | --hx1k  | -d 1k   | -d hx1k |
+| E40-HX1 | VQFP    |         |      | --      | -P      |         |
+| K-VQ100 | (14 x   |         |      | package | vq100   |         |
+|         | 14 mm)  |         |      | vq100   |         |         |
++---------+---------+---------+------+---------+---------+---------+
+| iC      | 144-pin | 0.50 mm | 96   | --hx1k  | -d 1k   | -d hx1k |
+| E40-HX1 | TQFP    |         |      | --      | -P      |         |
+| K-TQ144 | (20 x   |         |      | package | tq144   |         |
+|         | 20 mm)  |         |      | tq144   |         |         |
++---------+---------+---------+------+---------+---------+---------+
+| iC      | 144-pin | 0.50 mm | 107  | --hx8k  | -d 8k   | -d hx8k |
+| E40-HX4 | TQFP    |         |      | --      | -P      |         |
+| K-TQ144 | (20 x   |         |      | package | t       |         |
+|         | 20 mm)  |         |      | t       | q144:4k |         |
+|         |         |         |      | q144:4k |         |         |
++---------+---------+---------+------+---------+---------+---------+
+| iC      | 1       | 0.80 mm | 93   | --hx8k  | -d 8k   | -d hx8k |
+| E40-HX4 | 21-ball |         |      | --      | -P      |         |
+| K-BG121 | caBGA   |         |      | package | b       |         |
+|         | (9 x 9  |         |      | b       | g121:4k |         |
+|         | mm)     |         |      | g121:4k |         |         |
++---------+---------+---------+------+---------+---------+---------+
+| iC      | 1       | 0.80 mm | 93   | --hx8k  | -d 8k   | -d hx8k |
+| E40-HX8 | 21-ball |         |      | --      | -P      |         |
+| K-BG121 | caBGA   |         |      | package | bg121   |         |
+|         | (9 x 9  |         |      | bg121   |         |         |
+|         | mm)     |         |      |         |         |         |
++---------+---------+---------+------+---------+---------+---------+
+| iC      | 2       | 0.80 mm | 206  | --hx8k  | -d 8k   | -d hx8k |
+| E40-HX8 | 56-ball |         |      | --      | -P      |         |
+| K-CT256 | caBGA   |         |      | package | ct256   |         |
+|         | (14 x   |         |      | ct256   |         |         |
+|         | 14 mm)  |         |      |         |         |         |
++---------+---------+---------+------+---------+---------+---------+
+
+Current work focuses on further improving our timing analysis flow.
+
+How do I use the Fully Open Source iCE40 Flow?
+----------------------------------------------
+
+Synthesis for iCE40 FPGAs can be done with
+`Yosys <http://bygone.clairexen.net/yosys/>`__. Place-and-route can be
+done with `arachne-pnr <https://github.com/cseed/arachne-pnr>`__. Here
+is an example script for implementing and programming the `rot example
+from
+arachne-pnr <https://github.com/cseed/arachne-pnr/tree/master/examples/rot>`__
+(this example targets the iCEstick development board):
+
+::
+
+   yosys -p "synth_ice40 -blif rot.blif" rot.v
+   arachne-pnr -d 1k -p rot.pcf rot.blif -o rot.asc
+   icepack rot.asc rot.bin
+   iceprog rot.bin
+
+A simple timing analysis report can be generated using the ``icetime``
+utility:
+
+::
+
+   icetime -tmd hx1k rot.asc
+
+.. _install:
+
+Where are the Tools? How to install?
+------------------------------------
+
+Installing prerequisites (this command is for Ubuntu 14.04):
+
+::
+
+   sudo apt-get install build-essential clang bison flex libreadline-dev \
+                        gawk tcl-dev libffi-dev git mercurial graphviz   \
+                        xdot pkg-config python python3 libftdi-dev \
+                        qt5-default python3-dev libboost-all-dev cmake libeigen3-dev
+
+On Fedora 24 the following command installs all prerequisites:
+
+::
+
+   sudo dnf install make automake gcc gcc-c++ kernel-devel clang bison \
+                    flex readline-devel gawk tcl-devel libffi-devel git mercurial \
+                    graphviz python-xdot pkgconfig python python3 libftdi-devel \
+                    qt5-devel python3-devel boost-devel boost-python3-devel eigen3-devel
+
+Note: All tools will be installed relative to /usr/local
+
+Installing the `IceStorm Tools <https://github.com/YosysHQ/icestorm>`__
+(icepack, icebox, iceprog, icetime, chip databases):
+
+::
+
+   git clone https://github.com/YosysHQ/icestorm.git icestorm
+   cd icestorm
+   make -j$(nproc)
+   sudo make install
+
+Installing `Arachne-PNR <https://github.com/cseed/arachne-pnr>`__
+(place&route tool, predecessor to NextPNR):
+
+::
+
+   git clone https://github.com/cseed/arachne-pnr.git arachne-pnr
+   cd arachne-pnr
+   make -j$(nproc)
+   sudo make install
+
+Installing `NextPNR <https://github.com/YosysHQ/nextpnr>`__ (place&route
+tool, Arachne-PNR replacement):
+
+::
+
+   git clone --recursive https://github.com/YosysHQ/nextpnr nextpnr
+   cd nextpnr
+   cmake -DARCH=ice40 -DCMAKE_INSTALL_PREFIX=/usr/local .
+   make -j$(nproc)
+   sudo make install
+
+Installing `Yosys <http://bygone.clairexen.net/yosys/>`__ (Verilog
+synthesis):
+
+::
+
+   git clone https://github.com/YosysHQ/yosys.git yosys
+   cd yosys
+   make -j$(nproc)
+   sudo make install
+
+Both place and route tools (Arachne-PNR & NextPNR) convert the IceStorm
+text chip databases into the respective PNR binary chip databases during
+build. Always rebuild the PNR tools after updating your IceStorm
+installation.
+
+**Notes for Linux:** Create a file
+``/etc/udev/rules.d/53-lattice-ftdi.rules`` with the following line in
+it to allow uploading bit-streams to a Lattice iCEstick and/or a Lattice
+iCE40-HX8K Breakout Board as unprivileged user:
+
+::
+
+   ATTRS{idVendor}=="0403", ATTRS{idProduct}=="6010", MODE="0660", GROUP="plugdev", TAG+="uaccess"
+
+**Notes for Archlinux:** just install
+`icestorm-git <https://aur.archlinux.org/packages/icestorm-git/>`__,
+`arachne-pnr-git <https://aur.archlinux.org/packages/arachne-pnr-git/>`__
+and `yosys-git <https://aur.archlinux.org/packages/yosys-git/>`__ from
+the Arch User Repository (no need to follow the install instructions
+above).
+
+**Notes for OSX:** Please follow the `additional instructions for
+OSX <notes_osx.html>`__ to install on OSX.
+
+Please `file an issue on
+github <https://github.com/YosysHQ/icestorm/issues/new>`__ if you have
+additional notes to share regarding the install procedures on the
+operating system of your choice.
+
+What are the IceStorm Tools?
+----------------------------
+
+The IceStorm Tools are a couple of small programs for working with iCE40
+bitstream files and our ASCII representation of it. The complete Open
+Source iCE40 Flow consists of the `IceStorm
+Tools <https://github.com/YosysHQ/icestorm>`__,
+`Arachne-PNR <https://github.com/cseed/arachne-pnr>`__, and
+`Yosys <http://bygone.clairexen.net/yosys/>`__.
+
+IcePack/IceUnpack
+~~~~~~~~~~~~~~~~~
+
+The iceunpack program converts an iCE40 .bin file into the IceStorm
+ASCII format that has blocks of 0 and 1 for the config bits for each
+tile in the chip. The icepack program converts such an ASCII file back
+to an iCE40 .bin file. All other IceStorm Tools operate on the ASCII
+file format, not the bitstream binaries.
+
+IceTime
+~~~~~~~
+
+The icetime program is an iCE40 timing analysis tool. It reads designs
+in IceStorm ASCII format and writes times timing netlists that can be
+used in external timing analysers. It also includes a simple topological
+timing analyser that can be used to create timing reports.
+
+IceBox
+~~~~~~
+
+A python library and various tools for working with IceStorm ASCII files
+and accessing the device database. For example icebox_vlog converts our
+ASCII file dump of a bitstream into a Verilog file that implements an
+equivalent circuit.
+
+IceProg
+~~~~~~~
+
+A small driver program for the FTDI-based programmer used on the
+iCEstick and HX8K development boards.
+
+IceMulti
+~~~~~~~~
+
+A tool for packing multiple bitstream files into one iCE40 multiboot
+image file.
+
+IcePLL
+~~~~~~
+
+A small program for calculating iCE40 PLL configuration parameters.
+
+IceBRAM
+~~~~~~~
+
+A small program for swapping the BRAM contents in IceStorm ASCII files.
+E.g. for changing the firmware image in a SoC design without re-running
+synthesis and place&route.
+
+ChipDB
+~~~~~~
+
+The IceStorm Makefile builds and installs two files: chipdb-1k.txt and
+chipdb-8k.txt. This files contain all the relevant information for
+arachne-pnr to place&route a design and create an IceStorm ASCII file
+for the placed and routed design.
+
+*IcePack/IceUnpack, IceBox, IceProg, IceTime, and IcePLL are written by
+Claire Wolf. IcePack/IceUnpack is based on a reference implementation
+provided by Mathias Lasser. IceMulti is written by Marcus Comstedt.*
+
+Where do I get support or meet other IceStorm users?
+----------------------------------------------------
+
+If you have a question regarding the IceStorm flow, use the `yosys tag
+on stackoverflow <http://stackoverflow.com/questions/tagged/yosys>`__ to
+ask your question. If your question is a general question about Verilog
+HDL design, please consider using the `verilog tag on
+stackoverflow <http://stackoverflow.com/questions/tagged/verilog>`__
+instead.
+
+For general discussions go to the `Yosys
+Subreddit <https://www.reddit.com/r/yosys/>`__ or `#yosys on freenode
+IRC <http://webchat.freenode.net/?channels=yosys>`__.
+
+If you have a bug report please file an issue on github. (`IceStorm
+Issue Tracker <https://github.com/YosysHQ/icestorm/issues>`__, `Yosys
+Issue Tracker <https://github.com/YosysHQ/yosys/issues>`__, `Arachne-PNR
+Issue Tracker <https://github.com/cseed/arachne-pnr/issues>`__)
+
+.. _docs:
+
+Where is the Documentation?
+---------------------------
+
+Recommended reading: `Lattice iCE40 LP/HX Family
+Datasheet <http://www.latticesemi.com/~/media/LatticeSemi/Documents/DataSheets/iCE/iCE40LPHXFamilyDataSheet.pdf>`__,
+`Lattice iCE Technology
+Library <http://www.latticesemi.com/~/media/LatticeSemi/Documents/TechnicalBriefs/SBTICETechnologyLibrary201608.pdf>`__
+(Especially the three pages on "Architecture Overview", "PLB Blocks",
+"Routing", and "Clock/Control Distribution Network" in the Lattice iCE40
+LP/HX Family Datasheet. Read that first, then come back here.)
+
+The FPGA fabric is divided into tiles. There are IO, RAM and LOGIC
+tiles.
+
+-  `LOGIC Tile Documentation <logic_tile.html>`__
+-  `IO Tile Documentation <io_tile.html>`__
+-  `RAM Tile Documentation <ram_tile.html>`__
+-  `The Bitstream File Format <format.html>`__
+-  `The iCE40 HX1K Bit Docs <bitdocs-1k/>`__
+-  `The iCE40 HX8K Bit Docs <bitdocs-8k/>`__
+-  `Notes on UltraPlus features <ultraplus.html>`__
+
+The iceunpack program can be used to convert the bitstream into an ASCII
+file that has a block of 0 and 1 characters for each tile. For example:
+
+::
+
+   .logic_tile 12 12
+   000000000000000000000000000000000000000000000000000000
+   000000000000000000000011010000000000000000000000000000
+   000000000000000000000000000000000000000000000000000000
+   000000000000000000000000000000000000000000000000000000
+   000000000000000000000000000000000000000000000000000000
+   000000000000000000000000000000000000000000000000000000
+   000000000000000000000000000000000000000000000000000000
+   000000000000001011000000000000000000000000000000000000
+   000000000000000000000000000000000000000000000000000000
+   000000000000000000000000000000000000000000000000000000
+   000000000000000000000000000000000000000000000000000000
+   000000000000000000000000000000000000000000000000000000
+   000000000000000000000000000000000000000000000000000000
+   000000000000000000000000000000000000000000000000000000
+   000000000000000000000000001000001000010101010000000000
+   000000000000000000000000000101010000101010100000000000
+
+This bits are referred to as B\ y\ [x] in the documentation. For
+example, B0 is the first line, B0[0] the first bit in the first line,
+and B15[53] the last bit in the last line.
+
+The icebox_explain program can be used to turn this block of config bits
+into a description of the cell configuration:
+
+::
+
+   .logic_tile 12 12
+   LC_7 0101010110101010 0000
+   buffer local_g0_2 lutff_7/in_3
+   buffer local_g1_4 lutff_7/in_0
+   buffer sp12_h_r_18 local_g0_2
+   buffer sp12_h_r_20 local_g1_4
+
+IceBox contains a database of the wires and configuration bits that can
+be found in iCE40 tiles. This database can be accessed via the IceBox
+Python API. But IceBox is a large hack. So it is recommended to only use
+the IceBox API to export this database into a format that fits the
+target application. See icebox_chipdb for an example program that does
+that.
+
+The recommended approach for learning how to use this documentation is
+to synthesize very simple circuits using Yosys and Arachne-pnr, run the
+icestorm tool icebox_explain on the resulting bitstream files, and
+analyze the results using the HTML export of the database mentioned
+above. icebox_vlog can be used to convert the bitstream to Verilog. The
+output file of this tool will also outline the signal paths in comments
+added to the generated Verilog code.
+
+For example, consider the following Verilog and PCF files:
+
+::
+
+   // example.v
+   module top (input a, b, output y);
+     assign y = a & b;
+   endmodule
+
+   # example.pcf
+   set_io a 1
+   set_io b 10
+   set_io y 11
+
+And run them through Yosys, Arachne-PNR and IcePack:
+
+::
+
+   $ yosys -p 'synth_ice40 -top top -blif example.blif' example.v
+   $ arachne-pnr -d 1k -o example.asc -p example.pcf example.blif
+   $ icepack example.asc example.bin
+
+We would get something like the following icebox_explain output:
+
+::
+
+   $ icebox_explain example.asc
+   Reading file 'example.asc'..
+   Fabric size (without IO tiles): 12 x 16
+
+   .io_tile 0 10
+   IOB_1 PINTYPE_0
+   IOB_1 PINTYPE_3
+   IOB_1 PINTYPE_4
+   IoCtrl IE_0
+   IoCtrl IE_1
+   IoCtrl REN_0
+   buffer local_g0_5 io_1/D_OUT_0
+   buffer logic_op_tnr_5 local_g0_5
+
+   .io_tile 0 14
+   IOB_1 PINTYPE_0
+   IoCtrl IE_1
+   IoCtrl REN_0
+   buffer io_1/D_IN_0 span4_vert_b_6
+
+   .io_tile 0 11
+   IOB_0 PINTYPE_0
+   IoCtrl IE_0
+   IoCtrl REN_1
+   routing span4_vert_t_14 span4_horz_13
+
+   .logic_tile 1 11
+   LC_5 0001000000000000 0000
+   buffer local_g0_0 lutff_5/in_1
+   buffer local_g3_0 lutff_5/in_0
+   buffer neigh_op_lft_0 local_g0_0
+   buffer sp4_h_r_24 local_g3_0
+
+And something like the following icebox_vlog output:
+
+::
+
+   $ icebox_vlog -p example.pcf example.asc
+   // Reading file 'example.asc'..
+
+   module chip (output y, input b, input a);
+
+   wire y;
+   // io_0_10_1
+   // (0, 10, 'io_1/D_OUT_0')
+   // (0, 10, 'io_1/PAD')
+   // (0, 10, 'local_g0_5')
+   // (0, 10, 'logic_op_tnr_5')
+   // (0, 11, 'logic_op_rgt_5')
+   // (0, 12, 'logic_op_bnr_5')
+   // (1, 10, 'neigh_op_top_5')
+   // (1, 11, 'lutff_5/out')
+   // (1, 12, 'neigh_op_bot_5')
+   // (2, 10, 'neigh_op_tnl_5')
+   // (2, 11, 'neigh_op_lft_5')
+   // (2, 12, 'neigh_op_bnl_5')
+
+   wire b;
+   // io_0_11_0
+   // (0, 11, 'io_0/D_IN_0')
+   // (0, 11, 'io_0/PAD')
+   // (1, 10, 'neigh_op_tnl_0')
+   // (1, 10, 'neigh_op_tnl_4')
+   // (1, 11, 'local_g0_0')
+   // (1, 11, 'lutff_5/in_1')
+   // (1, 11, 'neigh_op_lft_0')
+   // (1, 11, 'neigh_op_lft_4')
+   // (1, 12, 'neigh_op_bnl_0')
+   // (1, 12, 'neigh_op_bnl_4')
+
+   wire a;
+   // io_0_14_1
+   // (0, 11, 'span4_horz_13')
+   // (0, 11, 'span4_vert_t_14')
+   // (0, 12, 'span4_vert_b_14')
+   // (0, 13, 'span4_vert_b_10')
+   // (0, 14, 'io_1/D_IN_0')
+   // (0, 14, 'io_1/PAD')
+   // (0, 14, 'span4_vert_b_6')
+   // (0, 15, 'span4_vert_b_2')
+   // (1, 11, 'local_g3_0')
+   // (1, 11, 'lutff_5/in_0')
+   // (1, 11, 'sp4_h_r_24')
+   // (1, 13, 'neigh_op_tnl_2')
+   // (1, 13, 'neigh_op_tnl_6')
+   // (1, 14, 'neigh_op_lft_2')
+   // (1, 14, 'neigh_op_lft_6')
+   // (1, 15, 'neigh_op_bnl_2')
+   // (1, 15, 'neigh_op_bnl_6')
+   // (2, 11, 'sp4_h_r_37')
+   // (3, 11, 'sp4_h_l_37')
+
+   assign y = /* LUT    1 11  5 */ b ? a : 0;
+
+   endmodule
+
+Links
+-----
+
+Links to related projects. Contact me at claire@clairexen.net if you
+have an interesting and relevant link.
+
+-  `J1a SwapForth built with
+   IceStorm <http://www.excamera.com/sphinx/article-j1a-swapforth.html>`__
+-  `Lattice iCEBlink40 Programming
+   Tool <https://github.com/davidcarne/iceBurn>`__
+-  `Another iCEBlink40 Programming
+   Tool <https://github.com/reactive-systems/icedude>`__
+-  `iCE40 layout viewer <https://github.com/knielsen/ice40_viewer>`__
+-  `icedrom iCE40 netlist viewer <http://drom.io/icedrom/>`__
+
+iCE40 Boards
+~~~~~~~~~~~~
+
+-  `Lattice iCEstick <http://www.latticesemi.com/icestick>`__
+-  `Lattice iCE40-HX8K Breakout
+   Board <http://www.latticesemi.com/en/Products/DevelopmentBoardsAndKits/iCE40HX8KBreakoutBoard.aspx>`__
+-  `IcoBoard <http://icoboard.org/>`__
+-  `wiggleport <http://wiggleport.com>`__
+-  `ICEd = an Arduino Style Board, with ICE
+   FPGA <https://hackaday.io/project/6636-iced-an-arduino-style-board-with-ice-fpga>`__
+-  `CAT Board <https://hackaday.io/project/7982-cat-board>`__
+-  `eCow-Logic pico-ITX Lattice ICE40
+   board <http://opencores.org/project,ecowlogic-pico>`__
+-  `Nandland Go
+   Board <https://www.nandland.com/blog/go-board-introduction.html>`__
+-  `myStorm board (iCE40 +
+   STM32) <https://folknologylabs.wordpress.com/2016/08/17/the-lull-before-the-storm/>`__
+-  `DSP iCE board (another iCE40 + STM32
+   board) <https://github.com/tvelliott/dsp_ice>`__
+-  `BeagleWire iCE40 FPGA BeagleBone
+   cape <https://www.crowdsupply.com/qwerty-embedded-design/beaglewire>`__
+
+Lectures and Tutorials
+~~~~~~~~~~~~~~~~~~~~~~
+
+-  `A Free and Open Source Verilog-to-Bitstream Flow for iCE40 FPGAs
+   [32c3] <https://media.ccc.de/v/32c3-7139-a_free_and_open_source_verilog-to-bitstream_flow_for_ice40_fpgas>`__
+-  `Synthesizing Verilog for Lattice ICE40 FPGAs (Paul
+   Martin) <https://www.youtube.com/watch?v=s7fNTF8nd8A>`__
+-  `A Spanish FPGA Tutorial using
+   IceStorm <https://github.com/Obijuan/open-fpga-verilog-tutorial/wiki>`__
+-  `IceStorm Learner’s
+   Documentation <http://hedmen.org/icestorm-doc/icestorm.html>`__
+
+Other FPGA bitstream documentation projects
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+-  `ECP5 bitstream documentation (Project
+   Trellis) <https://github.com/SymbiFlow/prjtrellis>`__
+-  `Xilinx 7-series bitstream documentation (Project
+   X-Ray) <https://github.com/SymbiFlow/prjxray>`__
+-  `Xilinx xc6slx9 documentation, Wolfgang
+   Spraul <https://github.com/Wolfgang-Spraul/fpgatools>`__
+-  `From the bitstream to the netlist, Jean-Baptiste Note and Éric
+   Rannaud <http://www.fabienm.eu/flf/wp-content/uploads/2014/11/Note2008.pdf>`__
+-  `Cyclone IV EP4CE6 documentation, Marek
+   Vasut <http://git.bfuser.eu/?p=marex/typhoon.git;a=commit>`__
+
+--------------
+
+In papers and reports, please refer to Project IceStorm as follows:
+Claire Wolf, Mathias Lasser. Project IceStorm.
+http://bygone.clairexen.net/icestorm/, e.g. using the following BibTeX
+code:
+
+::
+
+   @MISC{IceStorm,
+       author = {Claire Wolf and Mathias Lasser},
+       title = {Project IceStorm},
+       howpublished = "\url{http://bygone.clairexen.net/icestorm/}"
+   }
+
+--------------
+
+*Documentation mostly by Claire Wolf <claire@clairexen.net> in 2015.
+Based on research by Mathias Lasser and Claire Wolf.
+Buy an* `iCEstick <http://www.latticesemi.com/icestick>`__ *or*
+`iCE40-HX8K Breakout
+Board <http://www.latticesemi.com/en/Products/DevelopmentBoardsAndKits/iCE40HX8KBreakoutBoard.aspx>`__
+*from Lattice and see what you can do with the tools and information
+provided here.*
diff --git a/docs/source/ram_tile.rst b/docs/source/ram_tile.rst
new file mode 100644
index 0000000..d7888df
--- /dev/null
+++ b/docs/source/ram_tile.rst
@@ -0,0 +1,79 @@
+RAM Tile Documentation
+======================
+
+Span-4 and Span-12 Wires
+------------------------
+
+Regarding the Span-4 and Span-12 Wires a RAM tile behaves exactly like a
+LOGIC tile. So for simple applications that do not need the block ram
+resources, the RAM tiles can be handled like a LOGIC tiles without logic
+cells in them.
+
+Block RAM Resources
+-------------------
+
+A pair or RAM tiles (odd and even y-coordinates) provides an interface
+to a block ram cell. Like with LOGIC tiles, signals entering the RAM
+tile have to be routed over local tracks to the block ram inputs. Tiles
+with odd y-coordinates are "bottom" RAM Tiles (RAMB Tiles), and tiles
+with even y-coordinates are "top" RAM Tiles (RAMT Tiles). Each pair of
+RAMB/RAMT tiles implements a SB_RAM40_4K cell. The cell ports are spread
+out over the two tiles as follows:
+
+=========== =========== ===========
+SB_RAM40_4K RAMB Tile   RAMT Tile
+=========== =========== ===========
+RDATA[15:0] RDATA[7:0]  RDATA[15:8]
+RADDR[10:0] --          RADDR[10:0]
+WADDR[10:0] WADDR[10:0] --
+MASK[15:0]  MASK[7:0]   MASK[15:8]
+WDATA[15:0] WDATA[7:0]  WDATA[15:8]
+RCLKE       --          RCLKE
+RCLK        --          RCLK
+RE          --          RE
+WCLKE       WCLKE       --
+WCLK        WCLK        --
+WE          WE          --
+=========== =========== ===========
+
+The configuration bit RamConfig PowerUp in the RAMB tile enables the
+memory. This bit is active-low in 1k chips, i.e. an unused RAM block has
+only this bit set. Note that icebox_explain.py will ignore all RAMB
+tiles that only have the RamConfig PowerUp bit set.
+
+In 8k chips the RamConfig PowerUp bit is active-high. So an unused RAM
+block has all bits cleared in the 8k config bitstream.
+
+The RamConfig CBIT\_\* bits in the RAMT tile configure the read/write
+width of the memory. Those bits map to the SB_RAM40_4K cell parameters
+as follows:
+
+============= ================
+SB_RAM40_4K   RAMT Config Bit
+============= ================
+WRITE_MODE[0] RamConfig CBIT_0
+WRITE_MODE[1] RamConfig CBIT_1
+READ_MODE[0]  RamConfig CBIT_2
+READ_MODE[1]  RamConfig CBIT_3
+============= ================
+
+The read/write mode selects the width of the read/write port:
+
+==== ========== ====================================================
+MODE DATA Width Used WDATA/RDATA Bits
+==== ========== ====================================================
+0    16         15, 14, 13, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0
+1    8          14, 12, 10, 8, 6, 4, 2, 0
+2    4          13, 9, 5, 1
+3    2          11, 3
+==== ========== ====================================================
+
+The NegClk bit in the RAMB tile (1k die) or RAMT tile (other devices)
+negates the polarity of the WCLK port, and the NegClk bit in the RAMT
+(1k die) or RAMB tile (other devices) tile negates the polarity of the
+RCLK port.
+
+A logic tile sends the output of its eight logic cells to its neighbour
+tiles. A RAM tile does the same thing with the RDATA outputs. Each RAMB
+tile exports its RDATA[7:0] outputs and each RAMT tile exports its
+RDATA[15:8] outputs via this mechanism.
diff --git a/docs/source/ultraplus.rst b/docs/source/ultraplus.rst
new file mode 100644
index 0000000..7a0640d
--- /dev/null
+++ b/docs/source/ultraplus.rst
@@ -0,0 +1,759 @@
+UltraPlus Features Documentation
+================================
+
+The ice40 UltraPlus devices have a number of new features compared to
+the older LP/HX series devices, in particular:
+
+* Internal DSP units, capable of 16-bit multiply and 32-bit accumulate.
+* 1Mbit of extra single-ported RAM, in addition to the usual BRAM
+* Internal hard IP cores for I2C and SPI
+* 2 internal oscillators, 48MHz (with divider) and 10kHz
+* 24mA constant current LED ouputs and PWM hard IP
+
+In order to implement these new features, a significant architecural
+change has been made: the left and right sides of the device are no
+longer IO, but instead DSP and IPConnect tiles.
+
+Currently icestorm and arachne-pnr support the DSPs (except for
+cascading), SPRAM , internal oscillators and constant current LED
+drivers. Work to support the remaining features is underway.
+
+DSP Tiles
+---------
+
+Each MAC16 DSP comprises of 4 DSP tiles, all of which perform part of
+the DSP function and have different routing bit configurations.
+Structually they are similar to logic tiles, but with the DSP function
+wired into where the LUTs and DFFs would be. The four types of DSP tiles
+will be referred to as DSP0 through DSP3, with DSP0 at the lowest
+y-position. One signal CO, is also routed through the IPConnect tile
+above the DSP tile, referred to as IPCON4 in this context. The location
+of signals and configuration bits is documented below.
+
+| **Signal Assignments**
+
++----------+----------+----------+----------+----------+----------+
+| SB_MAC16 | DSP0     | DSP1     | DSP2     | DSP3     | IPCON4   |
+| port     |          |          |          |          |          |
++==========+==========+==========+==========+==========+==========+
+| CLK      | --       | --       | lutff_gl | --       | --       |
+|          |          |          | obal/clk |          |          |
++----------+----------+----------+----------+----------+----------+
+| CE       | --       | --       | lutff_gl | --       | --       |
+|          |          |          | obal/cen |          |          |
++----------+----------+----------+----------+----------+----------+
+| C[7:0]   | --       | --       | --       | l        | --       |
+|          |          |          |          | utff\_[7 |          |
+|          |          |          |          | :0]/in_3 |          |
++----------+----------+----------+----------+----------+----------+
+| C[15:8]  | --       | --       | --       | l        | --       |
+|          |          |          |          | utff\_[7 |          |
+|          |          |          |          | :0]/in_1 |          |
++----------+----------+----------+----------+----------+----------+
+| A[7:0]   | --       | --       | l        | --       | --       |
+|          |          |          | utff\_[7 |          |          |
+|          |          |          | :0]/in_3 |          |          |
++----------+----------+----------+----------+----------+----------+
+| A[15:8]  | --       | --       | l        | --       | --       |
+|          |          |          | utff\_[7 |          |          |
+|          |          |          | :0]/in_1 |          |          |
++----------+----------+----------+----------+----------+----------+
+| B[7:0]   | --       | l        | --       | --       | --       |
+|          |          | utff\_[7 |          |          |          |
+|          |          | :0]/in_3 |          |          |          |
++----------+----------+----------+----------+----------+----------+
+| B[15:8]  | --       | l        | --       | --       | --       |
+|          |          | utff\_[7 |          |          |          |
+|          |          | :0]/in_1 |          |          |          |
++----------+----------+----------+----------+----------+----------+
+| D[7:0]   | l        | --       | --       | --       | --       |
+|          | utff\_[7 |          |          |          |          |
+|          | :0]/in_3 |          |          |          |          |
++----------+----------+----------+----------+----------+----------+
+| D[15:8]  | l        | --       | --       | --       | --       |
+|          | utff\_[7 |          |          |          |          |
+|          | :0]/in_1 |          |          |          |          |
++----------+----------+----------+----------+----------+----------+
+| IRSTTOP  | --       | lutff_gl | --       | --       | --       |
+|          |          | obal/s_r |          |          |          |
++----------+----------+----------+----------+----------+----------+
+| IRSTBOT  | lutff_gl | --       | --       | --       | --       |
+|          | obal/s_r |          |          |          |          |
++----------+----------+----------+----------+----------+----------+
+| ORSTTOP  | --       | --       | --       | lutff_gl | --       |
+|          |          |          |          | obal/s_r |          |
++----------+----------+----------+----------+----------+----------+
+| ORSTBOT  | --       | --       | lutff_gl | --       | --       |
+|          |          |          | obal/s_r |          |          |
++----------+----------+----------+----------+----------+----------+
+| AHOLD    | --       | --       | lutf     | --       | --       |
+|          |          |          | f_0/in_0 |          |          |
++----------+----------+----------+----------+----------+----------+
+| BHOLD    | --       | lutf     | --       | --       | --       |
+|          |          | f_0/in_0 |          |          |          |
++----------+----------+----------+----------+----------+----------+
+| CHOLD    | --       | --       | --       | lutf     | --       |
+|          |          |          |          | f_0/in_0 |          |
++----------+----------+----------+----------+----------+----------+
+| DHOLD    | lutf     | --       | --       | --       | --       |
+|          | f_0/in_0 |          |          |          |          |
++----------+----------+----------+----------+----------+----------+
+| OHOLDTOP | --       | --       | --       | lutf     | --       |
+|          |          |          |          | f_1/in_0 |          |
++----------+----------+----------+----------+----------+----------+
+| OHOLDBOT | lutf     | --       | --       | --       | --       |
+|          | f_1/in_0 |          |          |          |          |
++----------+----------+----------+----------+----------+----------+
+| A        | --       | --       | --       | lutf     | --       |
+| DDSUBTOP |          |          |          | f_3/in_0 |          |
++----------+----------+----------+----------+----------+----------+
+| A        | lutf     | --       | --       | --       | --       |
+| DDSUBBOT | f_3/in_0 |          |          |          |          |
++----------+----------+----------+----------+----------+----------+
+| OLOADTOP | --       | --       | --       | lutf     | --       |
+|          |          |          |          | f_2/in_0 |          |
++----------+----------+----------+----------+----------+----------+
+| OLOADBOT | lutf     | --       | --       | --       | --       |
+|          | f_2/in_0 |          |          |          |          |
++----------+----------+----------+----------+----------+----------+
+| CI       | lutf     | --       | --       | --       | --       |
+|          | f_4/in_0 |          |          |          |          |
++----------+----------+----------+----------+----------+----------+
+| O[31:0]  | mult/    | mult/O   | mult/O\  | mult/O\  | --       |
+|          | O\_[7:0] | \_[15:8] | _[23:16] | _[31:24] |          |
++----------+----------+----------+----------+----------+----------+
+| CO       | --       | --       | --       | --       | slf_op_0 |
++----------+----------+----------+----------+----------+----------+
+
+| **Configuration Bits**
+
+The DSP configuration bits mostly follow the order stated in the ICE
+Technology Library document, where they are described as CBIT[24:0]. For
+most DSP tiles, these follow a logical order where CBIT[7:0] maps to
+DSP0 CBIT[7:0]; CBIT[15:8] to DSP1 CBIT[7:0], CBIT[23:16] to DSP2
+CBIT[7:0] and CBIT[24] to DSP3 CBIT0.
+
+However, there is one location where configuration bits are swapped
+between DSP tiles and IPConnect tiles. In DSP1 (0, 16) CBIT[4:1] are
+used for IP such as the internal oscillator, and the DSP configuration
+bits are then located in IPConnect tile (0, 19) CBIT[6:3].
+
+The full list of configuration bits, including the changes for the DSP
+at (0, 15) are described in the table below.
+
++-----------------------+-----------------------+-----------------------+
+| Parameter             | Normal Position       | DSP (0, 15)           |
+|                       |                       | Changes               |
++=======================+=======================+=======================+
+| C_REG                 | DSP0.CBIT_0           |                       |
++-----------------------+-----------------------+-----------------------+
+| A_REG                 | DSP0.CBIT_1           |                       |
++-----------------------+-----------------------+-----------------------+
+| B_REG                 | DSP0.CBIT_2           |                       |
++-----------------------+-----------------------+-----------------------+
+| D_REG                 | DSP0.CBIT_3           |                       |
++-----------------------+-----------------------+-----------------------+
+| TOP_8x8_MULT_REG      | DSP0.CBIT_4           |                       |
++-----------------------+-----------------------+-----------------------+
+| BOT_8x8_MULT_REG      | DSP0.CBIT_5           |                       |
++-----------------------+-----------------------+-----------------------+
+| PIP                   | DSP0.CBIT_6           |                       |
+| ELINE_16x16_MULT_REG1 |                       |                       |
++-----------------------+-----------------------+-----------------------+
+| PIP                   | DSP0.CBIT_7           |                       |
+| ELINE_16x16_MULT_REG2 |                       |                       |
++-----------------------+-----------------------+-----------------------+
+| TOPOUTPUT_SELECT[0]   | DSP1.CBIT_0           |                       |
++-----------------------+-----------------------+-----------------------+
+| TOPOUTPUT_SELECT[1]   | DSP1.CBIT_1           | (0, 19).CBIT_3        |
++-----------------------+-----------------------+-----------------------+
+| TOPA                  | DSP1.CBIT\_[3:2]      | (0, 19).CBIT\_[5:4]   |
+| DDSUB_LOWERINPUT[1:0] |                       |                       |
++-----------------------+-----------------------+-----------------------+
+| TOPADDSUB_UPPERINUT   | DSP1.CBIT_4           | (0, 19).CBIT_6        |
++-----------------------+-----------------------+-----------------------+
+| TOPAD                 | DSP1.CBIT\_[6:5]      |                       |
+| DSUB_CARRYSELECT[1:0] |                       |                       |
++-----------------------+-----------------------+-----------------------+
+| BOTOUTPUT_SELECT[0]   | DSP1.CBIT_7           |                       |
++-----------------------+-----------------------+-----------------------+
+| BOTOUTPUT_SELECT[1]   | DSP2.CBIT_0           |                       |
++-----------------------+-----------------------+-----------------------+
+| BOTA                  | DSP2.CBIT\_[2:1]      |                       |
+| DDSUB_LOWERINPUT[1:0] |                       |                       |
++-----------------------+-----------------------+-----------------------+
+| BOTADDSUB_UPPERINPUT  | DSP2.CBIT_3           |                       |
++-----------------------+-----------------------+-----------------------+
+| BOTAD                 | DSP2.CBIT\_[5:4]      |                       |
+| DSUB_CARRYSELECT[1:0] |                       |                       |
++-----------------------+-----------------------+-----------------------+
+| MODE_8x8              | DSP2.CBIT_6           |                       |
++-----------------------+-----------------------+-----------------------+
+| A_SIGNED              | DSP2.CBIT_7           |                       |
++-----------------------+-----------------------+-----------------------+
+| B_SIGNED              | DSP3.CBIT_0           |                       |
++-----------------------+-----------------------+-----------------------+
+
+Lattice document a limited number of supported configurations in the ICE
+Technology Library document, and Lattice's EDIF parser will reject
+designs not following a supported configuration. It is not yet known
+whether unsupported configurations (such as mixed signed and unsigned)
+function correctly or not.
+
+| **Other Implementation Notes**
+
+| All active DSP tiles, and all IPConnect tiles whether used or not,
+  have some bits set which reflect their logic tile heritage. The
+  LC\_\ x bits which would be used to configure the logic cell, are set
+  to the below pattern for each "logic cell" (interpreting them like a
+  logic tile):
+| 0000111100001111 0000
+| Coincidentally or not, this corresponds to a buffer passing through
+  input 2 to the output. For each "cell" the cascade bit
+  LC0\ x\ \_inmux02_5 is also set, effectively creating one large chain,
+  as this connects input 2 to the output of the previous LUT. The DSPs
+  at least will not function unless these bits are set correctly, so
+  they
+
+have some purpose and presumably indicate that the remains of a LUT are
+still present. There does not seem to be any case under which iCEcube
+generates a pattern other than this though.
+
+IPConnect Tiles
+---------------
+
+IPConnect tiles are used for connections to all of the other UltraPlus
+features, such as I2C/SPI, SPRAM, RGB and oscillators. Like DSP tiles,
+they are structually similar to logic tiles. The outputs of IP functions
+are connected to nets named slf_op_0 through slf_op_7, and the inputs
+use the LUT/FF inputs in the same way as DSP tiles.
+
+Internal Oscillators
+--------------------
+
+Both of the internal oscillators are connected through IPConnect tiles,
+with their outputs optionally connected to the global networks, by
+setting the "padin" extra bit (the used global networks 4 and 5 don't
+have physical pins on UltraPlus devices).
+
+SB_HFOSC
+~~~~~~~~
+
+| The CLKHFPU input connects through IPConnect tile (0, 29) input
+  lutff_0/in_1; and the CLKHFEN input connects through input
+  lutff_7/in_3 of the same tile.
+| The CLKHF output of SB_HFOSC is connected to both IPConnect tile (0,
+  28) output slf_op_7 and to the padin of glb_netwk_4.
+
+Configuration bit CLKHF_DIV[1] maps to DSP1 tile (0, 16) config bit
+CBIT_4, and CLKHF_DIV[0] maps to DSP1 tile (0, 16) config bit CBIT_3.
+
+There is also an undocumented trimming function of the HFOSC, using the
+ports TRIM0 through TRIM9. This can only be accessed directly in iCECUBE
+if you modify the standard cell library. However if you set the
+attribute VPP_2V5_TO_1P8V (which itself is not that well documented
+either) to 1 on the top level module, then the configuration bit CBIT_5
+of (0, 16) is set; and TRIM8 and TRIM4 are connected to the same net as
+CLKHFPU.
+
+TRIM[3:0] connect to (25, 28, lutff\_[7:4]/in_0) and TRIM[9:4] connect
+to (25, 29, lutff\_[5:0]/in_3). CBIT_5 of (0, 16) must be set to enable
+trimming. The trim range on the device used for testing was from 30.1 to
+75.9 MHz. TRIM9 seemed to have no effect, the other inputs could broadly
+be considered to form a binary word, however it appeared neither linear
+nor even monotonic.
+
+SB_LFOSC
+~~~~~~~~
+
+| The CLKLFPU input connects through IPConnect tile (25, 29) input
+  lutff_0/in_1; and the CLKLFEN input connects through input
+  lutff_7/in_3 of the same tile.
+| The CLKLF output of SB_LFOSC is connected to both IPConnect tile (25,
+  29) output slf_op_0 and to the padin of glb_netwk_5.
+
+SB_LFOSC has no configuration bits.
+
+SPRAM
+-----
+
+The UltraPlus devices have 1Mbit of extra single-ported RAM, split into
+4 256kbit blocks. The full list of connections for each SPRAM block in
+the 5k device is shown below, as well as the location of the 1
+configuration bit which is set to enable use of that SPRAM block.
+
++-------------+-------------+-------------+-------------+-------------+
+| Signal      | SPRAM (0,   | SPRAM (0,   | SPRAM (25,  | SPRAM (25,  |
+|             | 0, 1)       | 0, 2)       | 0, 3)       | 0, 4)       |
++=============+=============+=============+=============+=============+
+| A           | (0, 2,      | (0, 2,      | (25, 2,     | (25, 2,     |
+| DDRESS[1:0] | lutff\_     | lutff\_     | lutff\_     | lutff\_     |
+|             | [1:0]/in_1) | [7:6]/in_0) | [1:0]/in_1) | [7:6]/in_0) |
++-------------+-------------+-------------+-------------+-------------+
+| A           | (0, 2,      | (0, 3,      | (25, 2,     | (25, 3,     |
+| DDRESS[7:2] | lutff\_     | lutff\_     | lutff\_     | lutff\_     |
+|             | [7:2]/in_1) | [5:0]/in_3) | [7:2]/in_1) | [5:0]/in_3) |
++-------------+-------------+-------------+-------------+-------------+
+| A           | (0, 2,      | (0, 3,      | (25, 2,     | (25, 3,     |
+| DDRESS[9:8] | lutff\_     | lutff\_     | lutff\_     | lutff\_     |
+|             | [1:0]/in_0) | [7:6]/in_3) | [1:0]/in_0) | [7:6]/in_3) |
++-------------+-------------+-------------+-------------+-------------+
+| ADD         | (0, 2,      | (0, 3,      | (25, 2,     | (25, 3,     |
+| RESS[13:10] | lutff\_     | lutff\_     | lutff\_     | lutff\_     |
+|             | [5:2]/in_0) | [3:0]/in_1) | [5:2]/in_0) | [3:0]/in_1) |
++-------------+-------------+-------------+-------------+-------------+
+| DATAIN[7:0] | (0, 1,      | (0, 1,      | (25, 1,     | (25, 1,     |
+|             | lutff\_     | lutff\_     | lutff\_     | lutff\_     |
+|             | [7:0]/in_3) | [7:0]/in_0) | [7:0]/in_3) | [7:0]/in_0) |
++-------------+-------------+-------------+-------------+-------------+
+| D           | (0, 1,      | (0, 2,      | (25, 1,     | (25, 2,     |
+| ATAIN[15:8] | lutff\_     | lutff\_     | lutff\_     | lutff\_     |
+|             | [7:0]/in_1) | [7:0]/in_3) | [7:0]/in_1) | [7:0]/in_3) |
++-------------+-------------+-------------+-------------+-------------+
+| MA          | (0, 3,      | (0, 3,      | (25, 3,     | (25, 3,     |
+| SKWREN[3:0] | lutff\_     | lutff\_     | lutff\_     | lutff\_     |
+|             | [3:0]/in_0) | [7:4]/in_0) | [3:0]/in_0) | [7:4]/in_0) |
++-------------+-------------+-------------+-------------+-------------+
+| WREN        | (0, 3,      | (0, 3,      | (25, 3,     | (25, 3,     |
+|             | lu          | lu          | lu          | lu          |
+|             | tff_4/in_1) | tff_5/in_1) | tff_4/in_1) | tff_5/in_1) |
++-------------+-------------+-------------+-------------+-------------+
+| CHIPSELECT  | (0, 3,      | (0, 3,      | (25, 3,     | (25, 3,     |
+|             | lu          | lu          | lu          | lu          |
+|             | tff_6/in_1) | tff_7/in_1) | tff_6/in_1) | tff_7/in_1) |
++-------------+-------------+-------------+-------------+-------------+
+| CLOCK       | (0, 1, clk) | (0, 2, clk) | (25, 1,     | (25, 2,     |
+|             |             |             | clk)        | clk)        |
++-------------+-------------+-------------+-------------+-------------+
+| STANDBY     | (0, 4,      | (0, 4,      | (25, 4,     | (25, 4,     |
+|             | lu          | lu          | lu          | lu          |
+|             | tff_0/in_3) | tff_1/in_3) | tff_0/in_3) | tff_1/in_3) |
++-------------+-------------+-------------+-------------+-------------+
+| SLEEP       | (0, 4,      | (0, 4,      | (25, 4,     | (25, 4,     |
+|             | lu          | lu          | lu          | lu          |
+|             | tff_2/in_3) | tff_3/in_3) | tff_2/in_3) | tff_3/in_3) |
++-------------+-------------+-------------+-------------+-------------+
+| POWEROFF    | (0, 4,      | (0, 4,      | (25, 4,     | (25, 4,     |
+|             | lu          | lu          | lu          | lu          |
+|             | tff_4/in_3) | tff_5/in_3) | tff_4/in_3) | tff_5/in_3) |
++-------------+-------------+-------------+-------------+-------------+
+| D           | (0, 1,      | (0, 3,      | (25, 1,     | (25, 3,     |
+| ATAOUT[7:0] | slf         | slf         | slf         | slf         |
+|             | _op\_[7:0]) | _op\_[7:0]) | _op\_[7:0]) | _op\_[7:0]) |
++-------------+-------------+-------------+-------------+-------------+
+| DA          | (0, 2,      | (0, 4,      | (25, 2,     | (25, 4,     |
+| TAOUT[15:8] | slf         | slf         | slf         | slf         |
+|             | _op\_[7:0]) | _op\_[7:0]) | _op\_[7:0]) | _op\_[7:0]) |
++-------------+-------------+-------------+-------------+-------------+
+| *SP         | *(0, 1,     | *(0, 1,     | *(25, 1,    | *(25, 1,    |
+| RAM_ENABLE* | CBIT_0)*    | CBIT_1)*    | CBIT_0)*    | CBIT_1)*    |
++-------------+-------------+-------------+-------------+-------------+
+
+RGB LED Driver
+--------------
+
+The UltraPlus devices contain an internal 3-channel 2-24mA
+constant-current driver intended for RGB led driving (SB_RGBA_DRV). It
+is broken out onto 3 pins: 39, 40 and 41 on the QFN48 package. The LED
+driver is implemented using the IPConnect tiles and is entirely seperate
+to the IO cells, if the LED driver is ignored or disabled on a pin then
+the pin can be used as an open-drain IO using the standard IO cell.
+
+Note that the UltraPlus devices also have a seperate PWM generator IP
+core, which would often be connected to this one to create LED effects
+such as "breathing" without involving FPGA resources.
+
+The LED driver connections are shown in the label below.
+
+======== ======================
+Signal   Net
+======== ======================
+CURREN   (25, 29, lutff_6/in_3)
+RGBLEDEN (0, 30, lutff_1/in_1)
+RGB0PWM  (0, 30, lutff_2/in_1)
+RGB1PWM  (0, 30, lutff_3/in_1)
+RGB2PWM  (0, 30, lutff_4/in_1)
+======== ======================
+
+The configuration bits are as follows. As well as the documented bits,
+another bit RGBA_DRV_EN is set if any of the channels are enabled.
+
+================= ====================
+Parameter         Bit
+================= ====================
+RGBA_DRV_EN       (0, 28, CBIT_5)
+RGB0_CURRENT[1:0] (0, 28, CBIT\_[7:6])
+RGB0_CURRENT[5:2] (0, 29, CBIT\_[3:0])
+RGB1_CURRENT[3:0] (0, 29, CBIT\_[7:4])
+RGB1_CURRENT[5:4] (0, 30, CBIT\_[1:0])
+RGB2_CURRENT[5:0] (0, 30, CBIT\_[7:2])
+CURRENT_MODE      (0, 28, CBIT_4)
+================= ====================
+
+IO Changes
+----------
+
+The IO tiles contain a few new bits compared to earlier ice40 devices.
+The bits padeb_test_0 and padeb_test_1 are set for all pins, even unused
+ones, unless set as an output.
+
+There are also some new bits used to control the pullup strength:
+
++-----------------------+-----------------------+-----------------------+
+| Strength              | Cell 0                | Cell 1                |
++=======================+=======================+=======================+
+| 3.3kΩ                 | cf_bit_32             | cf_bit_36             |
+|                       | B7[10]                | B13[10]               |
++-----------------------+-----------------------+-----------------------+
+| 6.8kΩ                 | cf_bit_33             | cf_bit_37             |
+|                       | B6[10]                | B12[10]               |
++-----------------------+-----------------------+-----------------------+
+| 10kΩ                  | cf_bit_34             | cf_bit_38             |
+|                       | B7[15]                | B13[15]               |
++-----------------------+-----------------------+-----------------------+
+| 100kΩ                 | !cf_bit_35            | !cf_bit_39            |
+| (default)             | !B6[15]               | !B12[15]              |
++-----------------------+-----------------------+-----------------------+
+
+I\ :sup:`3`\ C capable IO
+~~~~~~~~~~~~~~~~~~~~~~~~~
+
+The UltraPlus devices have two IO pins designed for the new MIPI
+I\ :sup:`3`\ C standard (pins 23 and 25 in the SG48 package), compared
+to normal IO pins they have two switchable pullups each. One of these
+pullups, the weak pullup, is fixed at 100k and the other can be set to
+3.3k, 6.8k or 10k using the mechanism above. The pullup control signals
+do not connect directly to the IO tile, but instead connect through an
+IPConnect tile.
+
+The connections are listed below:
+
++-----------------------+-----------------------+-----------------------+
+| Signal                | Pin 23                | Pin 25                |
+|                       | (19, 31, 0)           | (19, 31, 1)           |
++=======================+=======================+=======================+
+| PU_ENB                | (25, 27,              | (25, 27,              |
+|                       | lutff_6/in_0)         | lutff_7/in_0)         |
++-----------------------+-----------------------+-----------------------+
+| WEAK_PU_ENB           | (25, 27,              | (25, 27,              |
+|                       | lutff_4/in_0)         | lutff_5/in_0)         |
++-----------------------+-----------------------+-----------------------+
+
+Hard IP
+-------
+
+The UltraPlus devices contain three types of Hard IP: I\ :sup:`2`\ C
+(SB_I2C), SPI (SB_SPI), and LED PWM generation (SB_LEDDA_IP). The
+connections and configurations for each of these blocks are documented
+below. Names in italics are parameters rather than actual bits, where
+multiple bits are used to enable an IP they are labeled as \_ENABLE_0,
+\_ENABLE_1, etc.
+
++-----------------------+-----------------------+-----------------------+
+| Signal                | I2C                   | I2C                   |
+|                       | (0, 31, 0)            | (25, 31, 0)           |
++=======================+=======================+=======================+
+| SBACKO                | (0, 30, slf_op_6)     | (25, 30, slf_op_6)    |
++-----------------------+-----------------------+-----------------------+
+| SBADRI0               | (0, 30, lutff_1/in_0) | (25, 30,              |
+|                       |                       | lutff_1/in_0)         |
++-----------------------+-----------------------+-----------------------+
+| SBADRI1               | (0, 30, lutff_2/in_0) | (25, 30,              |
+|                       |                       | lutff_2/in_0)         |
++-----------------------+-----------------------+-----------------------+
+| SBADRI2               | (0, 30, lutff_3/in_0) | (25, 30,              |
+|                       |                       | lutff_3/in_0)         |
++-----------------------+-----------------------+-----------------------+
+| SBADRI3               | (0, 30, lutff_4/in_0) | (25, 30,              |
+|                       |                       | lutff_4/in_0)         |
++-----------------------+-----------------------+-----------------------+
+| SBADRI4               | (0, 30, lutff_5/in_0) | (25, 30,              |
+|                       |                       | lutff_5/in_0)         |
++-----------------------+-----------------------+-----------------------+
+| SBADRI5               | (0, 30, lutff_6/in_0) | (25, 30,              |
+|                       |                       | lutff_6/in_0)         |
++-----------------------+-----------------------+-----------------------+
+| SBADRI6               | (0, 30, lutff_7/in_0) | (25, 30,              |
+|                       |                       | lutff_7/in_0)         |
++-----------------------+-----------------------+-----------------------+
+| SBADRI7               | (0, 29, lutff_2/in_0) | (25, 29,              |
+|                       |                       | lutff_2/in_0)         |
++-----------------------+-----------------------+-----------------------+
+| SBCLKI                | (0, 30, clk)          | (25, 30, clk)         |
++-----------------------+-----------------------+-----------------------+
+| SBDATI0               | (0, 29, lutff_5/in_0) | (25, 29,              |
+|                       |                       | lutff_5/in_0)         |
++-----------------------+-----------------------+-----------------------+
+| SBDATI1               | (0, 29, lutff_6/in_0) | (25, 29,              |
+|                       |                       | lutff_6/in_0)         |
++-----------------------+-----------------------+-----------------------+
+| SBDATI2               | (0, 29, lutff_7/in_0) | (25, 29,              |
+|                       |                       | lutff_7/in_0)         |
++-----------------------+-----------------------+-----------------------+
+| SBDATI3               | (0, 30, lutff_0/in_3) | (25, 30,              |
+|                       |                       | lutff_0/in_3)         |
++-----------------------+-----------------------+-----------------------+
+| SBDATI4               | (0, 30, lutff_5/in_1) | (25, 30,              |
+|                       |                       | lutff_5/in_1)         |
++-----------------------+-----------------------+-----------------------+
+| SBDATI5               | (0, 30, lutff_6/in_1) | (25, 30,              |
+|                       |                       | lutff_6/in_1)         |
++-----------------------+-----------------------+-----------------------+
+| SBDATI6               | (0, 30, lutff_7/in_1) | (25, 30,              |
+|                       |                       | lutff_7/in_1)         |
++-----------------------+-----------------------+-----------------------+
+| SBDATI7               | (0, 30, lutff_0/in_0) | (25, 30,              |
+|                       |                       | lutff_0/in_0)         |
++-----------------------+-----------------------+-----------------------+
+| SBDATO0               | (0, 29, slf_op_6)     | (25, 29, slf_op_6)    |
++-----------------------+-----------------------+-----------------------+
+| SBDATO1               | (0, 29, slf_op_7)     | (25, 29, slf_op_7)    |
++-----------------------+-----------------------+-----------------------+
+| SBDATO2               | (0, 30, slf_op_0)     | (25, 30, slf_op_0)    |
++-----------------------+-----------------------+-----------------------+
+| SBDATO3               | (0, 30, slf_op_1)     | (25, 30, slf_op_1)    |
++-----------------------+-----------------------+-----------------------+
+| SBDATO4               | (0, 30, slf_op_2)     | (25, 30, slf_op_2)    |
++-----------------------+-----------------------+-----------------------+
+| SBDATO5               | (0, 30, slf_op_3)     | (25, 30, slf_op_3)    |
++-----------------------+-----------------------+-----------------------+
+| SBDATO6               | (0, 30, slf_op_4)     | (25, 30, slf_op_4)    |
++-----------------------+-----------------------+-----------------------+
+| SBDATO7               | (0, 30, slf_op_5)     | (25, 30, slf_op_5)    |
++-----------------------+-----------------------+-----------------------+
+| SBRWI                 | (0, 29, lutff_4/in_0) | (25, 29,              |
+|                       |                       | lutff_4/in_0)         |
++-----------------------+-----------------------+-----------------------+
+| SBSTBI                | (0, 29, lutff_3/in_0) | (25, 29,              |
+|                       |                       | lutff_3/in_0)         |
++-----------------------+-----------------------+-----------------------+
+| I2CIRQ                | (0, 30, slf_op_7)     | (25, 30, slf_op_7)    |
++-----------------------+-----------------------+-----------------------+
+| I2CWKUP               | (0, 29, slf_op_5)     | (25, 29, slf_op_5)    |
++-----------------------+-----------------------+-----------------------+
+| SCLI                  | (0, 29, lutff_2/in_1) | (25, 29,              |
+|                       |                       | lutff_2/in_1)         |
++-----------------------+-----------------------+-----------------------+
+| SCLO                  | (0, 29, slf_op_3)     | (25, 29, slf_op_3)    |
++-----------------------+-----------------------+-----------------------+
+| SCLOE                 | (0, 29, slf_op_4)     | (25, 29, slf_op_4)    |
++-----------------------+-----------------------+-----------------------+
+| SDAI                  | (0, 29, lutff_1/in_1) | (25, 29,              |
+|                       |                       | lutff_1/in_1)         |
++-----------------------+-----------------------+-----------------------+
+| SDAO                  | (0, 29, slf_op_1)     | (25, 29, slf_op_1)    |
++-----------------------+-----------------------+-----------------------+
+| SDAOE                 | (0, 29, slf_op_2)     | (25, 29, slf_op_2)    |
++-----------------------+-----------------------+-----------------------+
+| *I2C_ENABLE_0*        | *(13, 31,             | *(19, 31,             |
+|                       | cbit2usealt_in_0)*    | cbit2usealt_in_0)*    |
++-----------------------+-----------------------+-----------------------+
+| *I2C_ENABLE_1*        | *(12, 31,             | *(19, 31,             |
+|                       | cbit2usealt_in_1)*    | cbit2usealt_in_1)*    |
++-----------------------+-----------------------+-----------------------+
+| *SDA_INPUT_DELAYED*   | *(12, 31,             | *(19, 31,             |
+|                       | SDA_input_delay)*     | SDA_input_delay)*     |
++-----------------------+-----------------------+-----------------------+
+| *SDA_OUTPUT_DELAYED*  | *(12, 31,             | *(19, 31,             |
+|                       | SDA_output_delay)*    | SDA_output_delay)*    |
++-----------------------+-----------------------+-----------------------+
+
++-----------------------+-----------------------+-----------------------+
+| Signal                | SPI                   | SPI                   |
+|                       | (0, 0, 0)             | (25, 0, 1)            |
++=======================+=======================+=======================+
+| SBACKO                | (0, 20, slf_op_1)     | (25, 20, slf_op_1)    |
++-----------------------+-----------------------+-----------------------+
+| SBADRI0               | (0, 19, lutff_1/in_1) | (25, 19,              |
+|                       |                       | lutff_1/in_1)         |
++-----------------------+-----------------------+-----------------------+
+| SBADRI1               | (0, 19, lutff_2/in_1) | (25, 19,              |
+|                       |                       | lutff_2/in_1)         |
++-----------------------+-----------------------+-----------------------+
+| SBADRI2               | (0, 20, lutff_0/in_3) | (25, 20,              |
+|                       |                       | lutff_0/in_3)         |
++-----------------------+-----------------------+-----------------------+
+| SBADRI3               | (0, 20, lutff_1/in_3) | (25, 20,              |
+|                       |                       | lutff_1/in_3)         |
++-----------------------+-----------------------+-----------------------+
+| SBADRI4               | (0, 20, lutff_2/in_3) | (25, 20,              |
+|                       |                       | lutff_2/in_3)         |
++-----------------------+-----------------------+-----------------------+
+| SBADRI5               | (0, 20, lutff_3/in_3) | (25, 20,              |
+|                       |                       | lutff_3/in_3)         |
++-----------------------+-----------------------+-----------------------+
+| SBADRI6               | (0, 20, lutff_4/in_3) | (25, 20,              |
+|                       |                       | lutff_4/in_3)         |
++-----------------------+-----------------------+-----------------------+
+| SBADRI7               | (0, 20, lutff_5/in_3) | (25, 20,              |
+|                       |                       | lutff_5/in_3)         |
++-----------------------+-----------------------+-----------------------+
+| SBCLKI                | (0, 20, clk)          | (25, 20, clk)         |
++-----------------------+-----------------------+-----------------------+
+| SBDATI0               | (0, 19, lutff_1/in_3) | (25, 19,              |
+|                       |                       | lutff_1/in_3)         |
++-----------------------+-----------------------+-----------------------+
+| SBDATI1               | (0, 19, lutff_2/in_3) | (25, 19,              |
+|                       |                       | lutff_2/in_3)         |
++-----------------------+-----------------------+-----------------------+
+| SBDATI2               | (0, 19, lutff_3/in_3) | (25, 19,              |
+|                       |                       | lutff_3/in_3)         |
++-----------------------+-----------------------+-----------------------+
+| SBDATI3               | (0, 19, lutff_4/in_3) | (25, 19,              |
+|                       |                       | lutff_4/in_3)         |
++-----------------------+-----------------------+-----------------------+
+| SBDATI4               | (0, 19, lutff_5/in_3) | (25, 19,              |
+|                       |                       | lutff_5/in_3)         |
++-----------------------+-----------------------+-----------------------+
+| SBDATI5               | (0, 19, lutff_6/in_3) | (25, 19,              |
+|                       |                       | lutff_6/in_3)         |
++-----------------------+-----------------------+-----------------------+
+| SBDATI6               | (0, 19, lutff_7/in_3) | (25, 19,              |
+|                       |                       | lutff_7/in_3)         |
++-----------------------+-----------------------+-----------------------+
+| SBDATI7               | (0, 19, lutff_0/in_1) | (25, 19,              |
+|                       |                       | lutff_0/in_1)         |
++-----------------------+-----------------------+-----------------------+
+| SBDATO0               | (0, 19, slf_op_1)     | (25, 19, slf_op_1)    |
++-----------------------+-----------------------+-----------------------+
+| SBDATO1               | (0, 19, slf_op_2)     | (25, 19, slf_op_2)    |
++-----------------------+-----------------------+-----------------------+
+| SBDATO2               | (0, 19, slf_op_3)     | (25, 19, slf_op_3)    |
++-----------------------+-----------------------+-----------------------+
+| SBDATO3               | (0, 19, slf_op_4)     | (25, 19, slf_op_4)    |
++-----------------------+-----------------------+-----------------------+
+| SBDATO4               | (0, 19, slf_op_5)     | (25, 19, slf_op_5)    |
++-----------------------+-----------------------+-----------------------+
+| SBDATO5               | (0, 19, slf_op_6)     | (25, 19, slf_op_6)    |
++-----------------------+-----------------------+-----------------------+
+| SBDATO6               | (0, 19, slf_op_7)     | (25, 19, slf_op_7)    |
++-----------------------+-----------------------+-----------------------+
+| SBDATO7               | (0, 20, slf_op_0)     | (25, 20, slf_op_0)    |
++-----------------------+-----------------------+-----------------------+
+| SBRWI                 | (0, 19, lutff_0/in_3) | (25, 19,              |
+|                       |                       | lutff_0/in_3)         |
++-----------------------+-----------------------+-----------------------+
+| SBSTBI                | (0, 20, lutff_6/in_3) | (25, 20,              |
+|                       |                       | lutff_6/in_3)         |
++-----------------------+-----------------------+-----------------------+
+| MCSNO0                | (0, 21, slf_op_2)     | (25, 21, slf_op_2)    |
++-----------------------+-----------------------+-----------------------+
+| MCSNO1                | (0, 21, slf_op_4)     | (25, 21, slf_op_4)    |
++-----------------------+-----------------------+-----------------------+
+| MCSNO2                | (0, 21, slf_op_7)     | (25, 21, slf_op_7)    |
++-----------------------+-----------------------+-----------------------+
+| MCSNO3                | (0, 22, slf_op_1)     | (25, 22, slf_op_1)    |
++-----------------------+-----------------------+-----------------------+
+| MCSNOE0               | (0, 21, slf_op_3)     | (25, 21, slf_op_3)    |
++-----------------------+-----------------------+-----------------------+
+| MCSNOE1               | (0, 21, slf_op_5)     | (25, 21, slf_op_5)    |
++-----------------------+-----------------------+-----------------------+
+| MCSNOE2               | (0, 22, slf_op_0)     | (25, 22, slf_op_0)    |
++-----------------------+-----------------------+-----------------------+
+| MCSNOE3               | (0, 22, slf_op_2)     | (25, 22, slf_op_2)    |
++-----------------------+-----------------------+-----------------------+
+| MI                    | (0, 22, lutff_0/in_1) | (25, 22,              |
+|                       |                       | lutff_0/in_1)         |
++-----------------------+-----------------------+-----------------------+
+| MO                    | (0, 20, slf_op_6)     | (25, 20, slf_op_6)    |
++-----------------------+-----------------------+-----------------------+
+| MOE                   | (0, 20, slf_op_7)     | (25, 20, slf_op_7)    |
++-----------------------+-----------------------+-----------------------+
+| SCKI                  | (0, 22, lutff_1/in_1) | (25, 22,              |
+|                       |                       | lutff_1/in_1)         |
++-----------------------+-----------------------+-----------------------+
+| SCKO                  | (0, 21, slf_op_0)     | (25, 21, slf_op_0)    |
++-----------------------+-----------------------+-----------------------+
+| SCKOE                 | (0, 21, slf_op_1)     | (25, 21, slf_op_1)    |
++-----------------------+-----------------------+-----------------------+
+| SCSNI                 | (0, 22, lutff_2/in_1) | (25, 22,              |
+|                       |                       | lutff_2/in_1)         |
++-----------------------+-----------------------+-----------------------+
+| SI                    | (0, 22, lutff_7/in_3) | (25, 22,              |
+|                       |                       | lutff_7/in_3)         |
++-----------------------+-----------------------+-----------------------+
+| SO                    | (0, 20, slf_op_4)     | (25, 20, slf_op_4)    |
++-----------------------+-----------------------+-----------------------+
+| SOE                   | (0, 20, slf_op_5)     | (25, 20, slf_op_5)    |
++-----------------------+-----------------------+-----------------------+
+| SPIIRQ                | (0, 20, slf_op_2)     | (25, 20, slf_op_2)    |
++-----------------------+-----------------------+-----------------------+
+| SPIWKUP               | (0, 20, slf_op_3)     | (25, 20, slf_op_3)    |
++-----------------------+-----------------------+-----------------------+
+| *SPI_ENABLE_0*        | *(7, 0,               | *(23, 0,              |
+|                       | cbit2usealt_in_0)*    | cbit2usealt_in_0)*    |
++-----------------------+-----------------------+-----------------------+
+| *SPI_ENABLE_1*        | *(7, 0,               | *(24, 0,              |
+|                       | cbit2usealt_in_1)*    | cbit2usealt_in_0)*    |
++-----------------------+-----------------------+-----------------------+
+| *SPI_ENABLE_2*        | *(6, 0,               | *(23, 0,              |
+|                       | cbit2usealt_in_0)*    | cbit2usealt_in_1)*    |
++-----------------------+-----------------------+-----------------------+
+| *SPI_ENABLE_3*        | *(6, 0,               | *(24, 0,              |
+|                       | cbit2usealt_in_1)*    | cbit2usealt_in_1)*    |
++-----------------------+-----------------------+-----------------------+
+
++-----------------------------------+-----------------------------------+
+| Signal                            | LEDDA_IP                          |
+|                                   | (0, 31, 2)                        |
++===================================+===================================+
+| LEDDADDR0                         | (0, 28, lutff_4/in_0)             |
++-----------------------------------+-----------------------------------+
+| LEDDADDR1                         | (0, 28, lutff_5/in_0)             |
++-----------------------------------+-----------------------------------+
+| LEDDADDR2                         | (0, 28, lutff_6/in_0)             |
++-----------------------------------+-----------------------------------+
+| LEDDADDR3                         | (0, 28, lutff_7/in_0)             |
++-----------------------------------+-----------------------------------+
+| LEDDCLK                           | (0, 29, clk)                      |
++-----------------------------------+-----------------------------------+
+| LEDDCS                            | (0, 28, lutff_2/in_0)             |
++-----------------------------------+-----------------------------------+
+| LEDDDAT0                          | (0, 28, lutff_2/in_1)             |
++-----------------------------------+-----------------------------------+
+| LEDDDAT1                          | (0, 28, lutff_3/in_1)             |
++-----------------------------------+-----------------------------------+
+| LEDDDAT2                          | (0, 28, lutff_4/in_1)             |
++-----------------------------------+-----------------------------------+
+| LEDDDAT3                          | (0, 28, lutff_5/in_1)             |
++-----------------------------------+-----------------------------------+
+| LEDDDAT4                          | (0, 28, lutff_6/in_1)             |
++-----------------------------------+-----------------------------------+
+| LEDDDAT5                          | (0, 28, lutff_7/in_1)             |
++-----------------------------------+-----------------------------------+
+| LEDDDAT6                          | (0, 28, lutff_0/in_0)             |
++-----------------------------------+-----------------------------------+
+| LEDDDAT7                          | (0, 28, lutff_1/in_0)             |
++-----------------------------------+-----------------------------------+
+| LEDDDEN                           | (0, 28, lutff_1/in_1)             |
++-----------------------------------+-----------------------------------+
+| LEDDEXE                           | (0, 28, lutff_0/in_1)             |
++-----------------------------------+-----------------------------------+
+| LEDDON                            | (0, 29, slf_op_0)                 |
++-----------------------------------+-----------------------------------+
+| PWMOUT0                           | (0, 28, slf_op_4)                 |
++-----------------------------------+-----------------------------------+
+| PWMOUT1                           | (0, 28, slf_op_5)                 |
++-----------------------------------+-----------------------------------+
+| PWMOUT2                           | (0, 28, slf_op_6)                 |
++-----------------------------------+-----------------------------------+
+
+The I\ :sup:`2`\ C "glitch filter" (referred to as SB_FILTER_50NS) is a
+seperate module from the I\ :sup:`2`\ C interface IP, with connections
+as shown below:
+
++-----------------------+-----------------------+-----------------------+
+| Signal                | SB_FILTER_50NS        | SB_FILTER_50NS        |
+|                       | (25, 31, 2)           | (25, 31, 3)           |
++=======================+=======================+=======================+
+| FILTERIN              | (25, 27,              | (25, 27,              |
+|                       | lutff_1/in_0)         | lutff_0/in_0)         |
++-----------------------+-----------------------+-----------------------+
+| FILTEROUT             | (25, 27, slf_op_2)    | (25, 27, slf_op_1)    |
++-----------------------+-----------------------+-----------------------+
+| ENABLE_0              | (25, 30, CBIT_2)      | (25, 30, CBIT_5)      |
++-----------------------+-----------------------+-----------------------+
+| ENABLE_1              | (25, 30, CBIT_3)      | (25, 30, CBIT_6)      |
++-----------------------+-----------------------+-----------------------+
+| ENABLE_2              | (25, 30, CBIT_4)      | (25, 30, CBIT_7)      |
++-----------------------+-----------------------+-----------------------+