litex/examples/sim/basic1.py

29 lines
804 B
Python

from migen.fhdl.std import *
from migen.sim.generic import run_simulation
# Our simple counter, which increments at every cycle
# and prints its current value in simulation.
class Counter(Module):
def __init__(self):
self.count = Signal(4)
# At each cycle, increase the value of the count signal.
# We do it with convertible/synthesizable FHDL code.
self.sync += self.count.eq(self.count + 1)
# This function will be called at every cycle.
def do_simulation(self, selfp):
# Simply read the count signal and print it.
# The output is:
# Count: 0
# Count: 1
# Count: 2
# ...
print("Count: " + str(selfp.count))
if __name__ == "__main__":
dut = Counter()
# Since we do not use StopSimulation, limit the simulation
# to some number of cycles.
run_simulation(dut, ncycles=20)