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flow/actor/PipelinedActor: clean up
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Sebastien Bourdeauducq committed Jul 12, 2013
1 parent 6aa1e0c commit c2d6f14087d7ce29353bcc7f7ad63c7c3f9adff9
Showing with 11 additions and 9 deletions.
  1. +11 −9 migen/flow/actor.py
@@ -90,15 +90,17 @@ def __init__(self, latency):
BinaryActor.__init__(self, latency)

def build_binary_control(self, stb_i, ack_o, stb_o, ack_i, latency):
valid = Signal(latency)
if latency > 1:
self.sync += If(self.pipe_ce, valid.eq(Cat(stb_i, valid[:latency-1])))
else:
self.sync += If(self.pipe_ce, valid.eq(stb_i))
last_valid = valid[latency-1]
busy = 0
valid = stb_i
for i in range(latency):
valid_n = Signal()
self.sync += If(self.pipe_ce, valid_n.eq(valid))
valid = valid_n
busy = busy | valid

self.comb += [
self.pipe_ce.eq(ack_i | ~last_valid),
self.pipe_ce.eq(ack_i | ~valid),
ack_o.eq(self.pipe_ce),
stb_o.eq(last_valid),
self.busy.eq(optree("|", [valid[i] for i in range(latency)]))
stb_o.eq(valid),
self.busy.eq(busy)
]

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