from collections import OrderedDict

from migen.fhdl.std import *
from migen.fhdl.std import *
from migen.genlib.resetsync import AsyncResetSynchronizer
from migen.genlib.record import *
from migen.genlib.fsm import FSM, NextState
from migen.genlib.misc import chooser
from migen.flow.actor import EndpointDescription
from migen.flow.actor import Sink, Source
from migen.actorlib.structuring import Converter, Pipeline
from migen.actorlib.fifo import SyncFIFO, AsyncFIFO
from migen.bank.description import *

eth_mtu = 1532
eth_preamble = 0xD555555555555555
buffer_depth = 2**log2_int(eth_mtu, need_pow2=False)

def eth_phy_description(dw):
	layout = [
		("data", dw),
		("error", dw//8)
	]
	return EndpointDescription(layout, packetized=True)

def eth_mac_description(dw):
	layout = [
		("data", dw),
		("last_be", dw//8),
		("error", dw//8)
	]
	return EndpointDescription(layout, packetized=True)