[breaking-change] Factor out "sram" resource.

Fixes #9.

1 files changed, 18 insertions, 0 deletions

diff --git a/nmigen_boards/dev/sram.py b/nmigen_boards/dev/sram.py
new file mode 100644
index 0000000..4e2cd91
--- /dev/null
+++ b/nmigen_boards/dev/sram.py
@@ -0,0 +1,18 @@
+from nmigen.build import *
+
+
+__all__ = ["SRAMResource"]
+
+
+def SRAMResource(*args, cs, oe, we, a, d, dm=None, attrs=None):
+    io = []
+    io.append(Subsignal("cs", PinsN(cs, dir="o")))
+    io.append(Subsignal("oe", PinsN(oe, dir="o")))
+    io.append(Subsignal("we", PinsN(we, dir="o")))
+    io.append(Subsignal("a", Pins(a, dir="o")))
+    io.append(Subsignal("d", Pins(d, dir="io")))
+    if dm is not None:
+        io.append(Subsignal("dm", PinsN(dm, dir="o"))) # dm="LB# UB#"
+    if attrs is not None:
+        io.append(attrs)
+    return Resource.family(*args, default_name="sram", ios=io)