from misoclib.com.liteeth.common import * from misoclib.com.liteeth.generic import * class LiteEthMACPaddingInserter(Module): def __init__(self, dw, packet_min_length): self.sink = sink = Sink(eth_phy_description(dw)) self.source = source = Source(eth_phy_description(dw)) # # # packet_min_data = math.ceil(packet_min_length/(dw/8)) self.submodules.counter = counter = Counter(max=eth_mtu) self.submodules.fsm = fsm = FSM(reset_state="COPY") fsm.act("COPY", counter.reset.eq(sink.stb & sink.sop), Record.connect(sink, source), If(sink.stb & sink.ack, counter.ce.eq(1), If(sink.eop, If(counter.value < packet_min_data, source.eop.eq(0), NextState("PADDING") ) ) ) ) fsm.act("PADDING", source.stb.eq(1), source.eop.eq(counter.value == packet_min_data), source.data.eq(0), If(source.ack, counter.ce.eq(1), If(source.eop, NextState("COPY") ) ) ) class LiteEthMACPaddingChecker(Module): def __init__(self, dw, packet_min_length): self.sink = sink = Sink(eth_phy_description(dw)) self.source = source = Source(eth_phy_description(dw)) # # # # XXX see if we should drop the packet when # payload size < minimum ethernet payload size self.comb += Record.connect(sink, source)