IP178G datasheet(27/76 Pages) ETC2

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IP178G

Data Sheet

27 / 76

December 19, 2012

IP178G-DS-R01.3

4.7.3.2

IPv4/IPv6 DiffServ

IP178G 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 21.30.[13] DIFFSERV_EN is enabled. IP178G

uses DiffServ or TC[7:2] as index to select one of 64 bits. If the bit is “1”, the received frame is handled as

a high priority frame. IP178G recognize the following DSCP (Differentiated Service Code Point) Octet as

high priority frame.

6’b101110

6’b001010

6’b010010

6’b011010

6’b100010

6’b11x000

6 byte

IPv4 frame format

TYPE=0800

Preamble

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

IPv6 frame format

TYPE=86DD

Preamble

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

Figure 8 IPv4/IPv6 DiffServ frame

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