SMSC LAN9312 - Manual (Page 376)

High Performance Two Port 10/100 Managed Ethernet Switch with 32-Bit Non-PCI CPU Interface
Datasheet
Revision 1.4 (08-19-08) 376 SMSC LAN9312
DATASHEET
14.5.3.9 Switch Engine VLAN Write Data Register (SWE_VLAN_WR_DATA)
This register is used write the VLAN or Port VID tables.
Register #: 180Ch Size: 32 bits
BITS DESCRIPTION TYPE DEFAULT
31:18 RESERVED RO -
17:0 Port Default VID and Priority
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:
R/W 0b
BITS DESCRIPTION DEFAULT
17 Member Port 2
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.
0b
16 Un-Tag Port 2
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) .
0b
15 Member Port 1
See description for Member Port 2. 0b
14 Un-Tag Port 1
See description for Un-Tag Port 2. 0b
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
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.
000h