litex/misoclib/liteeth/phy/sim.py

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

class LiteEthPHYSimCRG(Module, AutoCSR):
	def __init__(self):
		self._reset = CSRStorage()

		###

		self.clock_domains.cd_eth_rx = ClockDomain()
		self.clock_domains.cd_eth_tx = ClockDomain()
		self.comb += [
			self.cd_eth_rx.clk.eq(ClockSignal()),
			self.cd_eth_tx.clk.eq(ClockSignal())
		]

		reset = self._reset.storage
		self.comb += [
			self.cd_eth_rx.rst.eq(reset),
			self.cd_eth_tx.rst.eq(reset)
		]

class LiteEthPHYSim(Module, AutoCSR):
	def __init__(self, pads):
		self.dw = 8
		self.submodules.crg = LiteEthPHYSimCRG()
		self.sink = sink = Sink(eth_phy_description(8))
		self.source = source = Source(eth_phy_description(8))

		self.comb += [
			pads.source_stb.eq(self.sink.stb),
			pads.source_data.eq(self.sink.data),
			self.sink.ack.eq(1)
		]

		self.sync += [
			self.source.stb.eq(pads.sink_stb),
			self.source.sop.eq(pads.sink_stb & ~self.source.stb),
			self.source.data.eq(pads.sink_data),
		]
		self.comb += [
			self.source.eop.eq(~pads.sink_stb & self.source.stb),
		]