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25 lines
598 B
Python
25 lines
598 B
Python
2 years ago
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from amaranth import *
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__all__ = ["Timer"]
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class Timer(Elaboratable):
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def __init__(self, start):
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if not isinstance(start, int) or start < 0:
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raise TypeError("Start value must be a non-negative integer, not {!r}"
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.format(start))
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self.ctr = Signal(range(start + 1), reset=start, reset_less=True)
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self.zero = Signal()
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def elaborate(self, platform):
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m = Module()
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with m.If(self.ctr != 0):
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m.d.sync += self.ctr.eq(self.ctr - 1)
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m.d.comb += self.zero.eq(self.ctr == 0)
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return m
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