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fhdl/specials/Tristate: handle i=None

This commit is contained in:
Sebastien Bourdeauducq 2015-09-26 21:49:12 +08:00
parent e136352e8f
commit 09003a55e1
1 changed files with 3 additions and 2 deletions
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3
migen/fhdl/specials.py
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@ -44,7 +44,7 @@ class Tristate(Special):
self.target = wrap(target) self.target = wrap(target)
self.o = wrap(o) self.o = wrap(o)
self.oe = wrap(oe) self.oe = wrap(oe)
self.i = wrap(i) self.i = wrap(i) if i is not None else None
def iter_expressions(self): def iter_expressions(self):
for attr, target_context in [ for attr, target_context in [
@ -52,6 +52,7 @@ class Tristate(Special):
("o", SPECIAL_INPUT), ("o", SPECIAL_INPUT),
("oe", SPECIAL_INPUT), ("oe", SPECIAL_INPUT),
("i", SPECIAL_OUTPUT)]: ("i", SPECIAL_OUTPUT)]:
if getattr(self, attr) is not None:
yield self, attr, target_context yield self, attr, target_context
@staticmethod @staticmethod