lan9420 Standard Microsystems Corp., lan9420 Datasheet - Page 131

• Manufacturer Part Number: lan9420
• Description: Lan9420/lan9420i Single-chip Ethernet Controller With Hp Auto-mdix Support And Pci Interface
• Manufacturer: Standard Microsystems Corp.

Single-Chip Ethernet Controller with HP Auto-MDIX Support and PCI Interface
Datasheet
SMSC LAN9420/LAN9420i
4.4.9
31:16
BITS
15:0
RESERVED
VLAN1 Tag Identifier (VTI1)
This contains the VLAN Tag field to identify the VLAN1 frames. This field is
compared with the 13
frame detection.
VLAN1 Tag Register (VLAN1)
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:
th
and 14
DESCRIPTION
00A0h
th
bytes of the incoming frames for VLAN1
DATASHEET
131
Size:
32 bits
TYPE
R/W
RO
Revision 1.1 (03-31-08)
DEFAULT
FFFFh
-