litex/migen/flow/network.py

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import networkx as nx
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from migen.fhdl.structure import *
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from migen.flow.actor import *
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from migen.corelogic.misc import optree
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class CompositeActor(Actor):
def __init__(self, dfg):
self.dfg = dfg
# Internal unconnected endpoints become our endpoints. Determine them.
our_endpoints = []
for node in self.dfg:
endpoints = set(node.endpoints)
for u, v, d in self.dfg.in_edges([node], data=True):
endpoints.remove(d['sink'])
for u, v, d in self.dfg.out_edges([node], data=True):
endpoints.remove(d['source'])
our_endpoints += list(endpoints)
Actor.__init__(self,
SchedulingModel(SchedulingModel.DYNAMIC),
endpoints=our_endpoints)
def get_control_fragment(self):
this = sum([get_conn_control_fragment(x[2]['source'], x[2]['sink'])
for x in self.dfg.edges(data=True)], Fragment())
others = sum([node.get_control_fragment() for node in self.dfg], Fragment())
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busy = Fragment([self.busy.eq(optree('|', [node.busy for node in self.dfg]))])
return this + others + busy
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def get_process_fragment(self):
this = sum([get_conn_process_fragment(x[2]['source'], x[2]['sink'])
for x in self.dfg.edges(data=True)], Fragment())
others = sum([node.get_process_fragment() for node in self.dfg], Fragment())
return this + others
def add_connection(dfg, source_node, sink_node, source_ep=None, sink_ep=None):
if source_ep is None:
source_eps = source_node.sources()
assert(len(source_eps) == 1)
source_ep = source_eps[0]
if sink_ep is None:
sink_eps = sink_node.sinks()
assert(len(sink_eps) == 1)
sink_ep = sink_eps[0]
assert(isinstance(source_ep, Source))
assert(isinstance(sink_ep, Sink))
assert(source_ep in source_node.endpoints)
assert(sink_ep in sink_node.endpoints)
dfg.add_edge(source_node, sink_node, source=source_ep, sink=sink_ep)