LAN9250 datasheet(204/421 Pages) MICROCHIP

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LAN9250

DS00001913A-page 204

 2015 Microchip Technology Inc.

11.15.9

HOST MAC VLAN1 TAG REGISTER (HMAC_VLAN1)

This read/write register contains the VLAN tag field to identify VLAN1 frames. When a VLAN1 frame is detected, the

legal frame length is increased from 1518 bytes to 1522 bytes. Refer to Section 11.3, "Virtual Local Area Network

(VLAN) Support," on page 140 for additional information.

11.15.10 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 11.3, "Virtual Local Area Network

(VLAN) Support," on page 140 for additional information.

Offset:

09h

Size:

32 bits

Bits

Description

Type

Default

31:16

RESERVED

15:0

VLAN1 Tag Identifier (VTI1)

This field contains the VLAN Tag used to identify VLAN1 frames. This field is

compared with the 13th and 14th bytes of the incoming frames for VLAN1

frame detection.

Note:

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

8100h.

R/W

FFFFh

Offset:

0Ah

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

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