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compat.fhdl.specials: fix handling of tristate (i=None) pins.

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Fixes #406.
This commit is contained in:
whitequark 2020-07-02 22:22:44 +00:00
parent 369bc3e307
commit 8dd28fecc6
1 changed files with 10 additions and 5 deletions
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15
nmigen/compat/fhdl/specials.py
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@ -39,16 +39,21 @@ class Tristate(Elaboratable):
self.i = i if i is not None else None
def elaborate(self, platform):
if hasattr(platform, "get_input_output"):
pin = Pin(len(self.target), dir="oe" if self.i is None else "io")
if self.i is None:
pin = Pin(len(self.target), dir="oe")
pin.o = self.o
pin.oe = self.oe
if self.i is not None:
pin.i = self.i
return platform.get_tristate(pin, self.target, attrs={}, invert=None)
else:
pin = Pin(len(self.target), dir="io")
pin.o = self.o
pin.oe = self.oe
pin.i = self.i
return platform.get_input_output(pin, self.target, attrs={}, invert=None)
m = Module()
m.d.comb += self.i.eq(self.target)
if self.i is not None:
m.d.comb += self.i.eq(self.target)
m.submodules += Instance("$tribuf",
p_WIDTH=len(self.target),
i_EN=self.oe,