nextpnr/python/delay_vs_fanout.py

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with open("delay_vs_fanout.csv", "w") as f:
print("fanout,delay", file=f)
for net_name, net in ctx.nets:
if net.driver.cell is None:
continue
if net.driver.cell.type == "DCCA":
continue # ignore global clocks
for user in net.users:
print(f"{len(net.users)},{ctx.getNetinfoRouteDelay(net, user)}", file=f)