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nmigen reset problem
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Issue: Why is counter2 not reset when reset is toggled? | |
couter1 counter2 | |
0 0 | |
1 1 | |
2 1 | |
3 2 | |
4 2 | |
0 2 | |
1 3 | |
2 3 | |
3 4 | |
4 4 |
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from nmigen import * | |
from nmigen.sim import * | |
def main(): | |
print("Issue: Why is counter2 not reset when reset is toggled?") | |
m = Module() | |
m.domains += ClockDomain("sync") | |
m.domains += ClockDomain("second") | |
# Create a second clock domain that's half the frequency of sync | |
clk_second = ClockSignal("second") | |
m.d.sync += [ | |
clk_second.eq(~clk_second) | |
] | |
counter1 = Signal(16) | |
m.d.sync += counter1.eq(counter1 + 1) | |
counter2 = Signal(16) | |
m.d.second += counter2.eq(counter2 + 1) | |
# Tie a reset signal to both clock domains | |
reset = Signal() | |
m.d.comb += ResetSignal(domain="sync").eq(reset) | |
m.d.comb += ResetSignal(domain="second").eq(reset) | |
sim = Simulator(m) | |
sim.add_clock(1e-6) | |
print("couter1 counter2") | |
def process(): | |
print(f"{(yield counter1)}\t{(yield counter2)}") | |
yield Tick(); yield Delay(1e-8) | |
print(f"{(yield counter1)}\t{(yield counter2)}") | |
yield Tick(); yield Delay(1e-8) | |
print(f"{(yield counter1)}\t{(yield counter2)}") | |
yield Tick(); yield Delay(1e-8) | |
print(f"{(yield counter1)}\t{(yield counter2)}") | |
yield Tick(); yield Delay(1e-8) | |
print(f"{(yield counter1)}\t{(yield counter2)}") | |
yield reset.eq(1) | |
yield Tick(); yield Delay(1e-8) | |
yield Tick(); yield Delay(1e-8) | |
yield Tick(); yield Delay(1e-8) | |
yield Tick(); yield Delay(1e-8) | |
yield reset.eq(0) | |
print(f"{(yield counter1)}\t{(yield counter2)}") | |
yield Tick(); yield Delay(1e-8) | |
print(f"{(yield counter1)}\t{(yield counter2)}") | |
yield Tick(); yield Delay(1e-8) | |
print(f"{(yield counter1)}\t{(yield counter2)}") | |
yield Tick(); yield Delay(1e-8) | |
print(f"{(yield counter1)}\t{(yield counter2)}") | |
yield Tick(); yield Delay(1e-8) | |
print(f"{(yield counter1)}\t{(yield counter2)}") | |
yield Tick(); yield Delay(1e-8) | |
sim.add_process(process) | |
with sim.write_vcd("test.vcd"): | |
sim.run() | |
if __name__ == '__main__': | |
main() |
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