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More docs for etherbone packet fields. 

Info comes from http://www.ohwr.org/attachments/1669/spec.pdf dated 24 July 2012
This commit is contained in:
Tim Ansell 2017-09-01 23:57:34 +10:00 committed by GitHub
parent 797a91270f
commit 3a656c61d9
1 changed files with 12 additions and 9 deletions
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21
litex/soc/tools/remote/etherbone.py
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@ -3,6 +3,7 @@ import struct
from litex.soc.interconnect.stream_packet import HeaderField, Header
etherbone_magic = 0x4e6f
etherbone_version = 1
etherbone_packet_header_length = 8
@ -21,20 +22,22 @@ etherbone_packet_header = Header(etherbone_packet_header_fields,
etherbone_packet_header_length,
swap_field_bytes=True)
# When reading/writing to a FIFO, you don't increase
# the address after each write.
etherbone_record_header_length = 4
etherbone_record_header_fields = {
"bca": HeaderField(0, 0, 1),
"rca": HeaderField(0, 1, 1),
"rff": HeaderField(0, 2, 1),
"cyc": HeaderField(0, 4, 1),
"wca": HeaderField(0, 5, 1),
"wff": HeaderField(0, 6, 1),
"bca": HeaderField(0, 0, 1), # ReplyToCfgSpace - ??? (C)onfig (A)dress
"rca": HeaderField(0, 1, 1), # ReadFromCfgSpace - (R)ead from (C)onfig (A)dress
"rff": HeaderField(0, 2, 1), # ReadFIFO - (R)ead (F)I(F)O
"cyc": HeaderField(0, 4, 1), # DropCycle - Drop(Cyc)le
"wca": HeaderField(0, 5, 1), # WriteToCfgSpace - (W)rite to (C)onfig (A)dress
"wff": HeaderField(0, 6, 1), # WriteFIFO - (W)rite (F)I(F)O
"byte_enable": HeaderField(1, 0, 8),
"byte_enable": HeaderField(1, 0, 8), # Select
"wcount": HeaderField(2, 0, 8),
"wcount": HeaderField(2, 0, 8), # Writes
"rcount": HeaderField(3, 0, 8)
"rcount": HeaderField(3, 0, 8), # Reads
}
etherbone_record_header = Header(etherbone_record_header_fields,
etherbone_record_header_length,