LAN9312 datasheet(378/458 Pages) SMSC

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High Performance Two Port 10/100 Managed Ethernet Switch with 32-Bit Non-PCI CPU Interface

Datasheet

Revision 1.2 (04-08-08)

378

SMSC LAN9312

DATASHEET

14.5.3.10

Switch Engine VLAN Read Data Register (SWE_VLAN_RD_DATA)

This register is used to read the VLAN or Port VID tables.

180Eh

Size:

32 bits

BITS

DESCRIPTION

TYPE

DEFAULT

31:18

RESERVED

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.

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:

00000h

BITS

DESCRIPTION

DEFAULT

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.

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).

Member Port 1

See description for Member Port 2.

Un-Tag Port 1

See description for Un-Tag Port 2.

Member Port 0 (Host MAC)

See description for Member Port 2.

Un-Tag Port 0 (Host MAC)

See description for Un-Tag Port 2.

11:0

VID

These bits specify the VLAN ID associated with this VLAN

entry.

000h

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