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lib.cdc: use a local clock domain in ResetSynchronizer.

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This reverts commit 779f3ee906.
This reverts commit 300d47ca2e.
This reverts commit 9c54d0c061.
This commit is contained in:
whitequark 2019-08-19 20:47:40 +00:00
parent 71ee64c403
commit a069d975b2
2 changed files with 9 additions and 31 deletions
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20
nmigen/lib/cdc.py
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@ -82,16 +82,12 @@ class ResetSynchronizer(Elaboratable):
return platform.get_reset_sync(self)
m = Module()
for i, o in zip((Const(0, 1), *self._regs), self._regs):
m.submodules += Instance("$adff",
p_CLK_POLARITY=1,
p_ARST_POLARITY=1,
p_ARST_VALUE=Const(1, 1),
p_WIDTH=1,
i_CLK=ClockSignal(self.domain),
i_ARST=self.arst,
i_D=i,
o_Q=o
)
m.d.comb += ResetSignal(self.domain).eq(self._regs[-1])
m.domains += ClockDomain("reset_sync", async_reset=True, local=True)
for i, o in zip((0, *self._regs), self._regs):
m.d.reset_sync += o.eq(i)
m.d.comb += [
ClockSignal("reset_sync").eq(ClockSignal(self.domain)),
ResetSignal("reset_sync").eq(self.arst),
ResetSignal(self.domain).eq(self._regs[-1])
]
return m