myhdl/example/cookbook/latch/latch.py

import myhdl
from myhdl import *


def latch(q, d, g):

    @always_comb
    def comb():
        if g == 1:
            q.next = d

    return comb


from random import randrange


def test_latch():

    q, d, g = [Signal(bool(0)) for i in range(3)]

    latch_inst = latch(q, d, g)

    @always(delay(7))
    def dgen():
        d.next = randrange(2)

    @always(delay(41))
    def ggen():
        g.next = randrange(2)

    return latch_inst, dgen, ggen


def simulate(timesteps):
    tb = traceSignals(test_latch)
    sim = Simulation(tb)
    sim.run(timesteps)
    sim.quit()


simulate(20000)


def convert():
    q, d, g = [Signal(bool(0)) for i in range(3)]
    toVerilog(latch, q, d, g)
    conversion.analyze(latch, q, d, g)


convert()