99 lines
2.6 KiB
Python
99 lines
2.6 KiB
Python
from migen.fhdl.std import *
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from migen.flow.actor import *
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from migen.flow.transactions import *
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# Generators yield None or a tuple of Tokens.
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# Tokens for Sink endpoints are pulled and the "value" field filled in.
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# Tokens for Source endpoints are pushed according to their "value" field.
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#
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# NB: the possibility to push several tokens at once is important to interact
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# with actors that only accept a group of tokens when all of them are available.
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class TokenExchanger(Module):
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def __init__(self, generator, actor):
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self.generator = generator
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self.actor = actor
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self.active = set()
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self.busy = True
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self.done = False
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def _process_transactions(self, s):
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completed = set()
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for token in self.active:
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ep = getattr(self.actor, token.endpoint)
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if isinstance(ep, Sink):
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if s.rd(ep.ack) and s.rd(ep.stb):
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token.value = s.multiread(ep.payload)
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completed.add(token)
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s.wr(ep.ack, 0)
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elif isinstance(ep, Source):
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if s.rd(ep.ack) and s.rd(ep.stb):
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completed.add(token)
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s.wr(ep.stb, 0)
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else:
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raise TypeError
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self.active -= completed
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if not self.active:
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self.busy = True
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def _update_control_signals(self, s):
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for token in self.active:
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ep = getattr(self.actor, token.endpoint)
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if isinstance(ep, Sink):
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s.wr(ep.ack, 1)
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elif isinstance(ep, Source):
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s.multiwrite(ep.payload, token.value)
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s.wr(ep.stb, 1)
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else:
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raise TypeError
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def _next_transactions(self):
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try:
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transactions = next(self.generator)
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except StopIteration:
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self.done = True
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self.busy = False
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transactions = None
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if isinstance(transactions, Token):
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self.active = {transactions}
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elif isinstance(transactions, (tuple, list, set)):
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self.active = set(transactions)
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elif transactions is None:
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self.active = set()
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else:
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raise TypeError
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if self.active and all(transaction.idle_wait for transaction in self.active):
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self.busy = False
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def do_simulation(self, s):
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if not self.done:
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if self.active:
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self._process_transactions(s)
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if not self.active:
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self._next_transactions()
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self._update_control_signals(s)
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do_simulation.initialize = True
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class SimActor(Module):
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def __init__(self, generator):
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self.busy = Signal()
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self.submodules.token_exchanger = TokenExchanger(generator, self)
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def do_simulation(self, s):
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s.wr(self.busy, self.token_exchanger.busy)
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def _dumper_gen(prefix):
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while True:
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t = Token("result")
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yield t
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if len(t.value) > 1:
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s = str(t.value)
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else:
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s = str(list(t.value.values())[0])
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print(prefix + s)
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class Dumper(SimActor):
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def __init__(self, layout, prefix=""):
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self.result = Sink(layout)
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SimActor.__init__(self, _dumper_gen(prefix))
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