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flow/actor/PipelinedActor: clean up

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Sebastien Bourdeauducq 2013-07-12 18:52:34 +02:00
parent 6aa1e0c199
commit c2d6f14087
1 changed files with 11 additions and 9 deletions
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20
migen/flow/actor.py
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@ -90,15 +90,17 @@ class PipelinedActor(BinaryActor):
BinaryActor.__init__(self, latency) BinaryActor.__init__(self, latency)
def build_binary_control(self, stb_i, ack_o, stb_o, ack_i, latency): def build_binary_control(self, stb_i, ack_o, stb_o, ack_i, latency):
valid = Signal(latency) busy = 0
if latency > 1: valid = stb_i
self.sync += If(self.pipe_ce, valid.eq(Cat(stb_i, valid[:latency-1]))) for i in range(latency):
else: valid_n = Signal()
self.sync += If(self.pipe_ce, valid.eq(stb_i)) self.sync += If(self.pipe_ce, valid_n.eq(valid))
last_valid = valid[latency-1] valid = valid_n
busy = busy | valid
self.comb += [ self.comb += [
self.pipe_ce.eq(ack_i | ~last_valid), self.pipe_ce.eq(ack_i | ~valid),
ack_o.eq(self.pipe_ce), ack_o.eq(self.pipe_ce),
stb_o.eq(last_valid), stb_o.eq(valid),
self.busy.eq(optree("|", [valid[i] for i in range(latency)])) self.busy.eq(busy)
] ]