litex/examples/basic/graycounter.py

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from random import Random
from migen.fhdl.std import *
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from migen.genlib.cdc import GrayCounter
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from migen.sim.generic import run_simulation
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class TB(Module):
def __init__(self, width=3):
self.width = width
self.submodules.gc = GrayCounter(self.width)
self.prng = Random(7345)
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def do_simulation(self, selfp):
print("{0:0{1}b} CE={2} bin={3}".format(selfp.gc.q,
self.width, selfp.gc.ce, selfp.gc.q_binary))
selfp.gc.ce = self.prng.getrandbits(1)
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if __name__ == "__main__":
run_simulation(TB(), ncycles=35)