litex/liteeth/test/arp_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 import LiteEthMAC
from liteeth.core.arp import LiteEthARP

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

ip_address = 0x12345678
mac_address = 0x12345678abcd

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=False, loopback=False)
		self.submodules.arp_model = arp.ARP(self.mac_model, mac_address, ip_address, debug=False)

		self.submodules.mac = LiteEthMAC(self.phy_model, dw=8, with_hw_preamble_crc=True)
		self.submodules.arp = LiteEthARP(self.mac, mac_address, ip_address, 100000)

		# 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()),
		]

	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(100):
			yield

		while selfp.arp.table.request.ack != 1:
			selfp.arp.table.request.stb = 1
			selfp.arp.table.request.ip_address = 0x12345678
			yield
		selfp.arp.table.request.stb = 0
		while selfp.arp.table.response.stb != 1:
			selfp.arp.table.response.ack = 1
			yield
		print("Model's MAC : 0x%12x" %selfp.arp.table.response.mac_address)


if __name__ == "__main__":
	run_simulation(TB(), ncycles=2048, vcd_name="my.vcd", keep_files=True)