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gen/genlib/cdc: cleanup lcm computation, fix timeout on BusSynchronizer

This commit is contained in:
Florent Kermarrec 2017-04-25 15:13:47 +02:00
parent e0ce485a17
commit bb582619eb
1 changed files with 4 additions and 2 deletions
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6
litex/gen/genlib/cdc.py
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@ -7,6 +7,7 @@ from litex.gen.fhdl.structure import *
from litex.gen.fhdl.module import Module
from litex.gen.fhdl.specials import Special, Memory
from litex.gen.fhdl.bitcontainer import value_bits_sign
from litex.gen.fhdl.decorators import ClockDomainsRenamer
from litex.gen.genlib.misc import WaitTimer
from litex.gen.genlib.resetsync import AsyncResetSynchronizer
@ -99,7 +100,8 @@ class BusSynchronizer(Module):
sync_i += starter.eq(0)
self.submodules._ping = PulseSynchronizer(idomain, odomain)
self.submodules._pong = PulseSynchronizer(odomain, idomain)
self.submodules._timeout = WaitTimer(timeout)
self.submodules._timeout = ClockDomainsRenamer(idomain)(
WaitTimer(timeout))
self.comb += [
self._timeout.wait.eq(~self._ping.i),
self._ping.i.eq(starter | self._pong.o | self._timeout.done),
@ -198,7 +200,7 @@ class ElasticBuffer(Module):
def lcm(a, b):
"""Compute the lowest common multiple of a and b"""
return int(a * b / gcd(a, b))
return (a*b)//gcd(a, b)
class Gearbox(Module):