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corelogic/misc: displacer + chooser

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This commit is contained in:
Sebastien Bourdeauducq 2012-02-11 20:57:08 +01:00
parent e10e4360f3
commit 244bf17db7
1 changed files with 15 additions and 0 deletions
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15
migen/corelogic/misc.py
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@ -39,3 +39,18 @@ def split(v, *counts):
r.append(v[offset:offset+n])
offset += n
return tuple(r)
def displacer(signal, shift, output, n=None):
if n is None:
n = 2**shift.bv.width
w = signal.bv.width
l = [Replicate(shift == i, w) & signal for i in range(n)]
return output.eq(Cat(*l))
def chooser(signal, shift, output, n=None):
if n is None:
n = 2**shift.bv.width
w = signal.bv.width
cases = [[Constant(i, shift.bv), output.eq(signal[i*w:i*(w+1)])] for i in range(n)]
cases[n-1][0] = Default()
return Case(shift, *cases)