litex/liteethernet/mac/common.py

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2015-01-27 17:59:06 -05:00
from migen.fhdl.std import *
from migen.flow.actor import EndpointDescription
eth_mtu = 1532
eth_preamble = 0xD555555555555555
buffer_depth = 2**log2_int(eth_mtu, need_pow2=False)
def eth_description(dw):
layout = [
("d", dw),
("last_be", dw//8),
("error", dw//8)
]
return EndpointDescription(layout, packetized=True)