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inverters.
Note: this change does NOT affect pin functionality or naming, and
does not require modifying your design. It does however affect some
board files, where keywords corresponding to active low pins will have
to be adjusted:
SPIResource(0, cs="C1", ...) → SPIResource(0, cs_n="C1", ...)
The new naming scheme will make it easier to write and audit board
files by clearly marking inverted pins in resource factories, similarly to
how `PinsN` indicates the same in bare resources.
Fixes #129.
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According to the schematic, RTS and CTS are not connected to CH340G in
this version of the board.
Ref. https://github.com/monsonite/BackIce_FPGA/blob/master/BlackIce18_07_01D.pdf
and https://forum.mystorm.uk/uploads/default/original/1X/a5db1ce1c9bc2d91e63cfdc8424d699c2419a3d0.png
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The current hierarchy isn't particularly well suited to resources
like SDRAM or NOR flash, so make it much less fine-grained but easier
to use and less nitpicky.
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Expose blinky as a stable component, to make writing out-of-tree
board files a bit nicer.
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These resources were renamed as:
* user_led → led
* user_btn → button
* user_sw → switch
Fixes #13.
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SB_LVCMOS33 is not recognized by vendor tools. Use SB_LVCMOS instead.
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Fixes #9.
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Also, add missing pullups where appropriate.
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