LAN9312 Datasheet, PDF (282/458 Pages) SMSC Corporation – High Performance Two Port 10/100 Managed Ethernet Switch with 32-Bit Non-PCI CPU Interface

14.3.9
High Performance Two Port 10/100 Managed Ethernet Switch with 32-Bit Non-PCI CPU Interface
Datasheet
Host MAC VLAN1 Tag Register (HMAC_VLAN1)
Offset:
9h
Size:
32 bits
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 9.3,
"Virtual Local Area Network (VLAN) Support," on page 113 for additional information.
BITS
DESCRIPTION
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.
TYPE
RO
R/W
DEFAULT
-
FFFFh
Revision 1.2 (04-08-08)
282
DATASHEET
SMSC LAN9312