2015-02-05 18:54:05 -05:00
|
|
|
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():
|
2015-02-09 03:26:56 -05:00
|
|
|
raise ValueError("Protocol {0:#x} already assigned".format(protocol))
|
2015-02-05 18:54:05 -05:00
|
|
|
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)
|
