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