litex/liteeth/core/etherbone/probe.py

from liteeth.common import *
from liteeth.generic import *

class LiteEthEtherboneProbe(Module):
	def __init__(self):
		self.sink = sink = Sink(eth_etherbone_packet_user_description(32))
		self.source = source = Source(eth_etherbone_packet_user_description(32))
		###
		self.submodules.fsm = fsm = FSM(reset_state="IDLE")
		fsm.act("IDLE",
			sink.ack.eq(1),
			If(sink.stb & sink.sop,
				sink.ack.eq(0),
				NextState("PROBE_RESPONSE")
			)
		)
		fsm.act("PROBE_RESPONSE",
			Record.connect(sink, source),
			source.pf.eq(0),
			source.pr.eq(1),
			If(source.stb & source.eop & source.ack,
				NextState("IDLE")
			)
		)