64 lines
1.7 KiB
Python
64 lines
1.7 KiB
Python
from migen.flow.network import *
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from migen.flow import plumbing
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from migen.actorlib.ala import *
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from migen.actorlib.sim import *
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from migen.sim.generic import Simulator
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from migen.sim.icarus import Runner
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# Pushes a "1" token and then becomes transparent.
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class Init(Actor):
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def __init__(self, nbits):
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super().__init__(
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("in", Sink, [("d", BV(nbits))]),
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("out", Source, [("d", BV(nbits))]))
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def get_fragment(self):
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done = Signal()
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comb = [
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self.busy.eq(~done),
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If(done,
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self.endpoints["in"].ack.eq(self.endpoints["out"].ack),
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self.endpoints["out"].stb.eq(self.endpoints["in"].stb),
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self.endpoints["out"].token.d.eq(self.endpoints["in"].token.d)
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).Else(
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self.endpoints["in"].ack.eq(0),
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self.endpoints["out"].stb.eq(1),
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self.endpoints["out"].token.d.eq(1)
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)
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]
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sync = [
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If(self.endpoints["out"].ack, done.eq(1))
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]
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return Fragment(comb, sync)
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def main():
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nbits = 32
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# See:
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# http://www.csse.monash.edu.au/~damian/Idioms/Topics/12.1.DataFlow/html/text.html
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g = DataFlowGraph()
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adder = ActorNode(Add(BV(nbits)))
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bufadd = ActorNode(plumbing.Buffer) # TODO FIXME: deadlocks without this buffer
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init1 = ActorNode(Init(nbits))
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buf1 = ActorNode(plumbing.Buffer)
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init2 = ActorNode(Init(nbits))
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buf2 = ActorNode(plumbing.Buffer)
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g.add_connection(adder, bufadd)
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g.add_connection(bufadd, init1)
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g.add_connection(init1, buf1)
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g.add_connection(buf1, adder, sink_subr="a")
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g.add_connection(buf1, init2)
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g.add_connection(init2, buf2)
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g.add_connection(buf2, adder, sink_subr="b")
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g.add_connection(bufadd, ActorNode(Dumper([("r", BV(nbits))])))
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c = CompositeActor(g)
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fragment = c.get_fragment()
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sim = Simulator(fragment, Runner())
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sim.run(100)
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main()
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