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frontend/etherbone: add description

This commit is contained in:
Florent Kermarrec 2017-04-26 23:43:43 +02:00
parent f6d8ddbba0
commit e68e2ed73c
1 changed files with 11 additions and 1 deletions
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12
liteeth/frontend/etherbone.py
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@ -1,3 +1,14 @@
"""
Etherbone
CERN's Etherbone protocol is initially used to run a Wishbone bus over an
ethernet network. This re-implementation is meant to be run over ethernet
and introduces some limitations:
- no address spaces (rca/bca/wca/wff)
- 32bits data and address
- 1 record per frame
"""
from liteeth.common import * from liteeth.common import *
from litex.soc.interconnect import wishbone from litex.soc.interconnect import wishbone
@ -315,7 +326,6 @@ class LiteEthEtherboneRecordSender(Module):
class LiteEthEtherboneRecord(Module): class LiteEthEtherboneRecord(Module):
# Limitation: For simplicity we only support 1 record per packet
def __init__(self, endianness="big"): def __init__(self, endianness="big"):
self.sink = sink = stream.Endpoint(eth_etherbone_packet_user_description(32)) self.sink = sink = stream.Endpoint(eth_etherbone_packet_user_description(32))
self.source = source = stream.Endpoint(eth_etherbone_packet_user_description(32)) self.source = source = stream.Endpoint(eth_etherbone_packet_user_description(32))