litex/liteeth/test/mac_core_tb.py

from migen.fhdl.std import *
from migen.bus import wishbone
from migen.bus.transactions import *
from migen.sim.generic import run_simulation

from liteeth.common import *
from liteeth.mac.core import LiteEthMACCore

from liteeth.test.common import *
from liteeth.test.model import phy, mac

class TB(Module):
	def __init__(self):
		self.submodules.phy_model = phy.PHY(8, debug=False)
		self.submodules.mac_model = mac.MAC(self.phy_model, debug=True, loopback=True)
		self.submodules.core = LiteEthMACCore(phy=self.phy_model, dw=8, with_hw_preamble_crc=True)

		self.submodules.streamer = PacketStreamer(eth_phy_description(8), last_be=1)
		self.submodules.streamer_randomizer = AckRandomizer(eth_phy_description(8), level=50)

		self.submodules.logger_randomizer = AckRandomizer(eth_phy_description(8), level=50)
		self.submodules.logger = PacketLogger(eth_phy_description(8))

		# use sys_clk for each clock_domain
		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_rx.rst.eq(ResetSignal()),
			self.cd_eth_tx.clk.eq(ClockSignal()),
			self.cd_eth_tx.rst.eq(ResetSignal()),
		]

		self.comb += [
			Record.connect(self.streamer.source, self.streamer_randomizer.sink),
			Record.connect(self.streamer_randomizer.source, self.core.sink),
			Record.connect(self.core.source, self.logger_randomizer.sink),
			Record.connect(self.logger_randomizer.source, self.logger.sink)
		]

	def gen_simulation(self, selfp):
		selfp.cd_eth_rx.rst = 1
		selfp.cd_eth_tx.rst = 1
		yield
		selfp.cd_eth_rx.rst = 0
		selfp.cd_eth_tx.rst = 0

		for i in range(8):
			packet = mac.MACPacket([i for i in range(64)])
			packet.destination_mac_address = 0x010203040506
			packet.source_mac_address = 0x090A0B0C0C0D
			packet.ethernet_type = 0x0800
			packet.encode_header()
			yield from self.streamer.send(packet)
			yield from self.logger.receive()

			# check results
			s, l, e = check(packet, self.logger.packet)
			print("shift "+ str(s) + " / length " + str(l) + " / errors " + str(e))

if __name__ == "__main__":
	run_simulation(TB(), ncycles=4000, vcd_name="my.vcd", keep_files=True)