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vendor.lattice_ice40: never place an inverter on global buffer output.

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This would make `pin.i` not a global network anymore, which is likely
undesirable if an explicit Attrs(GLOBAL=1) is specified.
This commit is contained in:
whitequark 2019-06-14 20:44:02 +00:00
parent 01a3101fd3
commit 70bbfecf6d
1 changed files with 2 additions and 1 deletions
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3
nmigen/vendor/lattice_ice40.py vendored
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@ -164,6 +164,7 @@ class LatticeICE40Platform(TemplatedPlatform):
del attrs["GLOBAL"] del attrs["GLOBAL"]
else: else:
is_global_input = False is_global_input = False
assert not (is_global_input and i_invert)
if "i" in pin.dir: if "i" in pin.dir:
if pin.xdr < 2: if pin.xdr < 2:
@ -222,7 +223,7 @@ class LatticeICE40Platform(TemplatedPlatform):
if "i" in pin.dir: if "i" in pin.dir:
if pin.xdr == 0 and is_global_input: if pin.xdr == 0 and is_global_input:
io_args.append(("o", "GLOBAL_BUFFER_OUTPUT", pin_i[bit])) io_args.append(("o", "GLOBAL_BUFFER_OUTPUT", pin.i[bit]))
elif pin.xdr < 2: elif pin.xdr < 2:
io_args.append(("o", "D_IN_0", pin_i[bit])) io_args.append(("o", "D_IN_0", pin_i[bit]))
elif pin.xdr == 2: elif pin.xdr == 2: