High Performance Two Port 10/100 Managed Ethernet Switch with 32-Bit Non-PCI CPU Interface
Datasheet
14.5.3.9
Switch Engine VLAN Write Data Register (SWE_VLAN_WR_DATA)
Register #:
180Ch
Size:
32 bits
This register is used write the VLAN or Port VID tables.
BITS
DESCRIPTION
TYPE
DEFAULT
31:18
17:0
RESERVED
RO
-
Port Default VID and Priority
R/W
0b
When the port VID table is selected (PVIDnVLAN=1 of the Switch Engine
VLAN Command Register (SWE_VLAN_CMD)), bits 11:0 of this field specify
the default VID for the port and bits 14:12 specify the default priority. All
other bits of this field are reserved. These bits are used when a packet is
received without a VLAN tag or with a NULL VLAN ID. By default, the VID
and priority for all three ports is 0.
Note:
Values of 0 and FFFh should not be used since they are special
VLAN IDs per the IEEE 802.3Q specification.
VLAN Data
When the VLAN table is selected (PVIDnVLAN=0 of the Switch Engine
VLAN Command Register (SWE_VLAN_CMD)), the bits form the VLAN
table entry as follows:
BITS
17
DESCRIPTION
DEFAULT
Member Port 2
0b
Indicates the configuration of Port 2 for this VLAN entry.
1 = Member - Packets with a VID that matches this entry
are allowed on ingress. The port is a member of the
broadcast domain on egress.
0 = Not a Member - Packets with a VID that matches this
entry are filtered on ingress unless the Admit Non Member
bit in the Switch Engine Admit Non Member Register
(SWE_ADMT_N_MEMBER) is set for this port. The port is
not a member of the broadcast domain on egress.
16
Un-Tag Port 2
0b
When this bit is set, packets received on Port 2 with a VID
that matches this entry will have their tag removed when re-
transmitted by egress ports that are designated as Hybrid
ports via the Buffer Manager Egress Port Type Register
(BM_EGRSS_PORT_TYPE).
15
14
Member Port 1
0b
0b
See description for Member Port 2.
Un-Tag Port 1
See description for Un-Tag Port 2.
13
Member Port 0 (Host MAC)
See description for Member Port 2.
0b
12
Un-Tag Port 0 (Host MAC)
See description for Un-Tag Port 2.
0b
11:0
VID
000h
These bits specify the VLAN ID associated with this VLAN
entry.
To disable a VLAN entry, a value of 0 should be used.
Note:
A value of 0 is considered a NULL VLAN and
should not normally be used other than to
disable a VLAN entry.
Note:
A value of 3FFh is considered reserved by IEEE
802.1Q and should not be used.
SMSC LAN9312
377
Revision 1.2 (04-08-08)
DATASHEET
SMSC [ SMSC CORPORATION ]
