25 lines
715 B
Python
25 lines
715 B
Python
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from nmigen import *
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class RoundRobin:
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def __init__(self, n):
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self.n = n
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self.request = Signal(n)
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self.grant = Signal(max=n)
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def elaborate(self, platform):
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m = Module()
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n = self.n
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if n > 1:
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with m.Switch(self.grant):
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for i in range(n):
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with m.Case(i):
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with m.If(~self.request[i]):
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for j in reversed(range(i+1, i+n)):
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t = j % n
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with m.If(self.request[t]):
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m.d.sync += self.grant.eq(t)
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else:
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m.d.comb += self.grant.eq(0)
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return m
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