From a069d975b256cd60fb91c3443f8fe89e3c94df87 Mon Sep 17 00:00:00 2001 From: whitequark Date: Mon, 19 Aug 2019 20:47:40 +0000 Subject: [PATCH] lib.cdc: use a local clock domain in ResetSynchronizer. This reverts commit 779f3ee906190b92e5a07e5adcd62b20213bb936. This reverts commit 300d47ca2ebbabb31d2f191acf80c9b89659c4f0. This reverts commit 9c54d0c061884317d1558de9f9be52d1ec8dea68. --- nmigen/back/pysim.py | 20 +------------------- nmigen/lib/cdc.py | 20 ++++++++------------ 2 files changed, 9 insertions(+), 31 deletions(-) diff --git a/nmigen/back/pysim.py b/nmigen/back/pysim.py index 445acf0..a89556f 100644 --- a/nmigen/back/pysim.py +++ b/nmigen/back/pysim.py @@ -10,9 +10,6 @@ from ..tools import flatten from ..hdl.ast import * from ..hdl.ir import * from ..hdl.xfrm import ValueVisitor, StatementVisitor -from ..hdl.ast import DUID -from ..hdl.dsl import Module -from ..hdl.cd import ClockDomain __all__ = ["Simulator", "Delay", "Tick", "Passive", "DeadlineError"] @@ -359,24 +356,9 @@ class _StatementCompiler(StatementVisitor): return run -class _SimulatorPlatform: - def get_reset_sync(self, reset_sync): - m = Module() - cd = ClockDomain("_reset_sync_{}".format(DUID().duid), async_reset=True) - m.domains += cd - for i, o in zip((0, *reset_sync._regs), reset_sync._regs): - m.d[cd.name] += o.eq(i) - m.d.comb += [ - ClockSignal(cd.name).eq(ClockSignal(reset_sync.domain)), - ResetSignal(cd.name).eq(reset_sync.arst), - ResetSignal(reset_sync.domain).eq(reset_sync._regs[-1]) - ] - return m - - class Simulator: def __init__(self, fragment, vcd_file=None, gtkw_file=None, traces=()): - self._fragment = Fragment.get(fragment, platform=_SimulatorPlatform()) + self._fragment = Fragment.get(fragment, platform=None) self._signal_slots = SignalDict() # Signal -> int/slot self._slot_signals = list() # int/slot -> Signal diff --git a/nmigen/lib/cdc.py b/nmigen/lib/cdc.py index 802a865..9b0cc07 100644 --- a/nmigen/lib/cdc.py +++ b/nmigen/lib/cdc.py @@ -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 -- 2.30.2