2015-02-05 18:54:05 -05:00
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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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from liteeth.core.ip.common import *
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class LiteEthIPV4Crossbar(Module):
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def __init__(self):
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self.users = OrderedDict()
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self.master = LiteEthIPV4MasterPort(8)
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def get_port(self, protocol):
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if protocol in self.users.keys():
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2015-02-09 03:26:56 -05:00
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raise ValueError("Protocol {0:#x} already assigned".format(protocol))
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2015-02-10 05:22:23 -05:00
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port = LiteEthIPV4UserPort(8)
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2015-02-05 18:54:05 -05:00
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self.users[protocol] = port
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return port
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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.ip_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.ip_dispatcher = Dispatcher(self.master.sink, sources, one_hot=True)
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cases = {}
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cases["default"] = self.ip_dispatcher.sel.eq(0)
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for i, (k, v) in enumerate(self.users.items()):
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cases[k] = self.ip_dispatcher.sel.eq(2**i)
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self.comb += \
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Case(self.master.sink.protocol, cases)
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