31 lines
973 B
Python
31 lines
973 B
Python
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from collections import OrderedDict
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from liteeth.common import *
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from liteeth.generic.arbiter import Arbiter
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from liteeth.generic.dispatcher import Dispatcher
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class LiteEthCrossbar(Module):
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def __init__(self, master_port, dispatch_param):
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self.users = OrderedDict()
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self.master = master_port(8)
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self.dispatch_param = dispatch_param
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# overload this in derived classes
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def get_port(self, *args, **kwargs):
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pass
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def do_finalize(self):
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# TX arbitrate
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sinks = [port.sink for port in self.users.values()]
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self.submodules.arbiter = Arbiter(sinks, self.master.source)
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# RX dispatch
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sources = [port.source for port in self.users.values()]
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self.submodules.dispatcher = Dispatcher(self.master.sink, sources, one_hot=True)
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cases = {}
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cases["default"] = self.dispatcher.sel.eq(0)
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for i, (k, v) in enumerate(self.users.items()):
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cases[k] = self.dispatcher.sel.eq(2**i)
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self.comb += \
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Case(getattr(self.master.sink, self.dispatch_param), cases)
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