34 lines
1.2 KiB
Python
34 lines
1.2 KiB
Python
from collections import OrderedDict
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from misoclib.com.liteusb.common import *
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class LiteUSBCrossbar(Module):
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def __init__(self):
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self.users = OrderedDict()
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self.master = LiteUSBMasterPort(8)
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self.dispatch_param = "dst"
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def get_port(self, dst):
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port = LiteUSBUserPort(8, dst)
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if dst in self.users.keys():
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raise ValueError("Destination {0:#x} already assigned".format(dst))
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self.users[dst] = 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.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,
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sources,
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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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