litex/migen/flow/hooks.py

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from migen.fhdl.structure import *
from migen.flow.actor import *
from migen.sim.generic import PureSimulable
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class EndpointSimHook(PureSimulable):
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def __init__(self, endpoint):
self.endpoint = endpoint
def on_ack(self):
pass
def on_nack(self):
pass
def on_inactive(self):
pass
def do_simulation(self, s):
if s.rd(self.endpoint.stb):
if s.rd(self.endpoint.ack):
self.on_ack()
else:
self.on_nack()
else:
self.on_inactive()
class DFGHook:
def __init__(self, dfg, create):
assert(not dfg.is_abstract())
self.nodepair_to_ep = dict()
for u, v, data in dfg.edges_iter(data=True):
if (u, v) in self.nodepair_to_ep:
ep_to_hook = self.nodepair_to_ep[(u, v)]
else:
ep_to_hook = dict()
self.nodepair_to_ep[(u, v)] = ep_to_hook
ep = data["source"]
ep_to_hook[ep] = create(u, ep, v)
def hooks_iter(self):
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for v1 in self.nodepair_to_ep.values():
for v2 in v1.values():
yield v2
def get_fragment(self):
return sum([h.get_fragment() for h in self.hooks_iter()], Fragment())