litex/migen/genlib/resetsync.py

19 lines
568 B
Python

from migen.fhdl.structure import *
from migen.fhdl.specials import Special
class AsyncResetSynchronizer(Special):
def __init__(self, cd, async_reset):
Special.__init__(self)
self.cd = cd
self.async_reset = async_reset
def iter_expressions(self):
yield self.cd, "clk", SPECIAL_INPUT
yield self.cd, "rst", SPECIAL_OUTPUT
yield self, "async_reset", SPECIAL_INPUT
@staticmethod
def lower(dr):
raise NotImplementedError("Attempted to use a reset synchronizer, but platform does not support them")