LAN9730 Datasheet, PDF (174/222 Pages) SMSC Corporation – High-Speed Inter-Chip (HSIC) USB 2.0

LAN9730/LAN9730i
6.4.9 VLAN1 TAG REGISTER (VLAN1)
Address:
120h
Size:
32 bits
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 TLI is empty.
Bits
31:16
15:0
Description
RESERVED
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.
Type
RO
R/W
Default
-
FFFFh
DS00001946A-page 174
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