litex/liteeth/core/ip/crossbar.py

34 lines
1.1 KiB
Python

from collections import OrderedDict
from liteeth.common import *
from liteeth.generic.arbiter import Arbiter
from liteeth.generic.dispatcher import Dispatcher
from liteeth.core.ip.common import *
class LiteEthIPV4Crossbar(Module):
def __init__(self):
self.users = OrderedDict()
self.master = LiteEthIPV4MasterPort(8)
def get_port(self, protocol):
port = LiteEthIPV4UserPort(8)
if protocol in self.users.keys():
raise ValueError("Protocol {0:#x} already assigned".format(protocol))
self.users[protocol] = port
return port
def do_finalize(self):
# TX arbitrate
sinks = [port.sink for port in self.users.values()]
self.submodules.ip_arbiter = Arbiter(sinks, self.master.source)
# RX dispatch
sources = [port.source for port in self.users.values()]
self.submodules.ip_dispatcher = Dispatcher(self.master.sink, sources, one_hot=True)
cases = {}
cases["default"] = self.ip_dispatcher.sel.eq(0)
for i, (k, v) in enumerate(self.users.items()):
cases[k] = self.ip_dispatcher.sel.eq(2**i)
self.comb += \
Case(self.master.sink.protocol, cases)