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nix-scripts/gluelogic/mirny-almazny.diff

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diff --git a/mirny.py b/mirny.py
index 6c041de..73991b1 100644
--- a/mirny.py
+++ b/mirny.py
@@ -135,7 +135,7 @@ class SR(Module):
)
]
- def connect_ext(self, ext, adr, mask):
+ def connect_ext(self, ext, adr, mask, sdi_passthrough=False):
adr &= mask
self._check_intersection(adr, mask)
self._slaves.append((ext, adr, mask))
@@ -146,12 +146,16 @@ class SR(Module):
stb.ce.eq(self.bus.re),
# don't glitch with &stb.o
ext.sck.eq(self.ext.sck),
- ext.sdi.eq(self.ext.sdi & stb.o),
ext.cs.eq(stb.o),
If(stb.o,
self.ext.sdo.eq(ext.sdo),
),
]
+ # Almazny shares one SDI with 4 devices, it cannot be masked by stb
+ if sdi_passthrough:
+ self.comb += ext.sdi.eq(self.ext.sdi)
+ else:
+ self.comb += ext.sdi.eq(self.ext.sdi & stb.o),
def intersection(a, b):
@@ -360,7 +364,7 @@ class Mirny(Module):
]
ext = Record(ext_layout)
- self.sr.connect_ext(ext, adr=i + 12, mask=mask)
+ self.sr.connect_ext(ext, adr=i + 12, mask=mask, sdi_passthrough=True)
self.comb += [
mezz[i + 3].oe.eq(1),
mezz[i + 3].o.eq(~ext.cs), # Almazny REG_LATCH