61 lines
1.9 KiB
Python
61 lines
1.9 KiB
Python
from migen.fhdl.std import *
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from migen.flow.actor import *
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from migen.genlib.record import *
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from migen.genlib.misc import optree
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class Buffer(PipelinedActor):
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def __init__(self, layout):
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self.d = Sink(layout)
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self.q = Source(layout)
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PipelinedActor.__init__(self, 1)
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self.sync += If(self.pipe_ce, self.q.payload.eq(self.d.payload))
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class Combinator(Module):
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def __init__(self, layout, subrecords):
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self.source = Source(layout)
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sinks = []
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for n, r in enumerate(subrecords):
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s = Sink(layout_partial(layout, *r))
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setattr(self, "sink"+str(n), s)
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sinks.append(s)
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self.busy = Signal()
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###
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self.comb += [
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self.busy.eq(0),
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self.source.stb.eq(optree("&", [sink.stb for sink in sinks]))
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]
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self.comb += [sink.ack.eq(self.source.ack & self.source.stb) for sink in sinks]
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self.comb += [self.source.payload.eq(sink.payload) for sink in sinks]
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class Splitter(Module):
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def __init__(self, layout, subrecords):
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self.sink = Sink(layout)
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sources = []
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for n, r in enumerate(subrecords):
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s = Source(layout_partial(layout, *r))
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setattr(self, "source"+str(n), s)
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sources.append(s)
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self.busy = Signal()
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###
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self.comb += [source.payload.eq(self.sink.payload) for source in sources]
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already_acked = Signal(len(sources))
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self.sync += If(self.sink.stb,
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already_acked.eq(already_acked | Cat(*[s.ack for s in sources])),
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If(self.sink.ack, already_acked.eq(0))
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)
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self.comb += self.sink.ack.eq(optree("&",
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[s.ack | already_acked[n] for n, s in enumerate(sources)]))
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for n, s in enumerate(sources):
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self.comb += s.stb.eq(self.sink.stb & ~already_acked[n])
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# Actors whose layout should be inferred from what their single sink is connected to.
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layout_sink = {Buffer, Splitter}
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# Actors whose layout should be inferred from what their single source is connected to.
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layout_source = {Buffer, Combinator}
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# All actors.
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actors = layout_sink | layout_source
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