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IP175C/IP175C LF/IP175CH/IP175CH LF
Data Sheet
2.9.2.2
IPv4/IPv6 DiffServ
IP175C/IP175CH 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 30.27.0 DIFFSEV_EN is enabled.
IP175C/IP175CH uses DiffServ or TC[7:2] as index to select one of 64 bits defined in the MII register
30.28~31 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
Mar 09, 2007
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Copyright © 2004, IC Plus Corp.
IP175C/IP175CH-DS-R14
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