LAN9312 datasheet(283/458 Pages) SMSC

Part #	LAN9312

Description	High Performance Two Port 10/100 Managed Ethernet Switch with 32-Bit Non-PCI CPU Interface

PDF	458 Pages

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Manufacturer	SMSC [SMSC Corporation]

Direct Link	http://www.smsc.com

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High Performance Two Port 10/100 Managed Ethernet Switch with 32-Bit Non-PCI CPU Interface

Datasheet

SMSC LAN9312

283

Revision 1.2 (04-08-08)

DATASHEET

14.3.10

Host MAC VLAN2 Tag Register (HMAC_VLAN2)

This read/write register contains the VLAN tag field to identify VLAN2 frames. When a VLAN2 frame

is detected, the legal frame length is increased from 1518 bytes to 1538 bytes. Refer to Section 9.3,

"Virtual Local Area Network (VLAN) Support," on page 113 for additional information.

Offset:

Size:

32 bits

BITS

DESCRIPTION

TYPE

DEFAULT

31:16

RESERVED

15:0

VLAN2 Tag Identifier (VTI2)

This field contains the VLAN Tag used to identify VLAN2 frames. This field

is compared with the 13th and 14th bytes of the incoming frames for VLAN2

frame detection.

Note:

If used, this register is typically set to the standard VLAN value of

8100h. If both VLAN1 and VLAN2 Tag Identifiers are used, they

should be unique. If both are set to the same value, VLAN1 is

given higher precedence and the maximum legal frame length is

set to 1522.

R/W

FFFFh

LAN9312 Datasheet(PDF) 283 Page - SMSC Corporation