IP178CLF datasheet(41/91 Pages) ETC1

Part #	IP178CLF

Description	8 Port 10/100 Ethernet Integrated Switch

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Manufacturer	ETC1 [List of Unclassifed Manufacturers]

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IP178C

Preliminary Data Sheet

IPv4/IPv6 DiffServ

IP178C 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

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

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

41/91

October 27, 2005

IP178C-DS-R09

IP178CLF Datasheet(PDF) 41 Page - List of Unclassifed Manufacturers

IP178CLF Datasheet(HTML) 41 Page - List of Unclassifed Manufacturers

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