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corelogic: round-robin module

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This commit is contained in:
Sebastien Bourdeauducq 2011-12-08 21:15:02 +01:00
parent 7c99e51b90
commit 78f18ad593
2 changed files with 22 additions and 0 deletions
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migen/corelogic/__init__.py Normal file
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migen/corelogic/roundrobin.py Normal file
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from migen.fhdl import structure as f
class Inst:
def __init__(self, n):
self.n = n
self.bn = f.BitsFor(self.n-1)
f.Declare(self, "request", f.BV(self.n))
f.Declare(self, "grant", f.BV(self.bn))
def GetFragment(self):
cases = []
for i in range(self.n):
switch = []
for j in reversed(range(i+1,i+self.n)):
t = j % self.n
switch = [f.If(self.request[t],
[f.Assign(self.grant, f.Constant(t, f.BV(self.bn)))],
switch)]
case = f.If(~self.request[i], switch)
cases.append((f.Constant(i, f.BV(self.bn)), case))
statement = f.Case(self.grant, cases)
return f.Fragment(sync=[statement])