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IP178C/IP178C LF/IP178CH/IP178CH LF
Datasheet
IPv4/IPv6 DiffServ
IP178C/IP178CH checks the DiffServ field of a IPv4 frame or Traffic class field [7:2] (TC[7:2]) of a IPv6
frame and uses them to decide the frame’s priority if MII register 31.30.[13] DIFFSERV_EN is enabled.
IP178C/IP178CH uses DiffServ or TC [7:2] as index to select one of 64 bits defined in the MII register
31.22~25 DSCP[63:0]. If the bit is “1”, the received frame is handled as a high priority frame.
6 byte
DA
IPv4 frame format
TYPE=0800
Preamble
SA
SFD
802.1Q tag
(optional)
DATA
FCS
6 byte
4 byte
2 byte
Header
Size
RES
VER=0100
4 bit
2 byte
4 bit
6 bit
DiffServ
2 bit
6 byte
DA
IPv6 frame format
TYPE=86DD
Preamble
SA
SFD
802.1Q tag
(optional)
DATA
FCS
6 byte
4 byte
2 byte
----
RES
VER=0110
4 bit
2 byte
4 bit
6 bit
Traffic Class[7:2]
2 bit
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June 21, 2007
Copyright © 2004, IC Plus Corp.
IP178Cx-DS-R12
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