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build.res: give a more specific error for add_clock_constraint(ClockSignal).

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Fixes #542.
This commit is contained in:
Wanda 2024-04-06 13:14:44 +02:00 committed by Catherine
parent 6fb5f3f120
commit 38ad35757b
1 changed files with 5 additions and 1 deletions
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6
amaranth/build/res.py
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@ -242,7 +242,11 @@ class ResourceManager:
yield f"{port_name}[{bit}]", pin_name, attrs yield f"{port_name}[{bit}]", pin_name, attrs
def add_clock_constraint(self, clock, frequency): def add_clock_constraint(self, clock, frequency):
if not isinstance(clock, Signal): if isinstance(clock, ClockSignal):
raise TypeError(f"A clock constraint can only be applied to a Signal, but a "
f"ClockSignal is provided; assign the ClockSignal to an "
f"intermediate signal and constrain the latter instead.")
elif not isinstance(clock, Signal):
raise TypeError(f"Object {clock!r} is not a Signal") raise TypeError(f"Object {clock!r} is not a Signal")
if not isinstance(frequency, (int, float)): if not isinstance(frequency, (int, float)):
raise TypeError(f"Frequency must be a number, not {frequency!r}") raise TypeError(f"Frequency must be a number, not {frequency!r}")