SMSC LAN9420i Manual De Usuario

Single-Chip Ethernet Controller with HP Auto-MDIX Support and PCI Interface

Revision 1.22 (09-25-08)

130

SMSC LAN9420/LAN9420i

This register contains the VLAN tag field to identify VLAN1 frames. For VLAN frames the legal frame
length is increased from 1518 bytes to 1522 bytes.

The RXCOE also uses this register to determine the protocol value to use to indicate the existence of
a VLAN tag. When using the RXCOE, this value may only be changed if the RX path is disabled. If it
is desired to change this value during run time, it is safe to do so only after the MAC is disabled and
the MIL is empty.

Offset:

00A0h

Size:

32 bits

31:16

RO

-

15:0

VLAN1 Tag Identifier (VTI1)
This contains the VLAN Tag field to identify the VLAN1 frames. This field is 
compared with the 13

th

 and 14

th

 bytes of the incoming frames for VLAN1 

frame detection.

R/W

FFFFh