LAN9312 datasheet(424/458 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)

424

SMSC LAN9312

DATASHEET

14.5.4.13

Buffer Manager Egress Port Type Register (BM_EGRSS_PORT_TYPE)

This register is used to configure the egress VLAN tagging rules. See Section 6.5.6, "Adding,

Removing, and Changing VLAN Tags," on page 79 for additional details.

1C0Ch

Size:

32 bits

BITS

DESCRIPTION

TYPE

DEFAULT

31:22

RESERVED

Insert Tag Port 2

When set, untagged packets will have a tag added that contains the Default

VLAN ID and Priority of the ingress port.

The un-tag bit in the VLAN table for the default VLAN ID also needs to be

cleared in order for the tag to be inserted.

This is only used when the Egress Port Type is set as Hybrid.

R/W

Change VLAN ID Port 2

When set, regular tagged packets will have their VLAN ID overwritten with

the Default VLAN ID of the egress port.

The Change Tag bit also needs to be set.

The un-tag bit in the VLAN table for the incoming VLAN ID also needs to be

cleared, otherwise the tag will be removed instead.

Priority tagged packets will have VLAN ID overwritten with the Default VLAN

ID of the ingress port independent of this bit.

This is only used when the Egress Port Type is set as Hybrid.

R/W

Change Priority Port 2

When set, regular tagged packets will have their Priority overwritten with the

Default Priority of the egress port. Priority tagged packets will have VLAN ID

overwritten with the Default VLAN ID of the ingress port.

For regular tagged packets, the Change Tag bit also needs to be set.

The un-tag bit in the VLAN table for the incoming VLAN ID also needs to be

cleared, otherwise the tag would be removed instead.

This is only used when the Egress Port Type is set as Hybrid.

R/W

Change Tag Port 2

When set, allows the Change Tag and Change Priority bits to affect regular

tagged packets.

This bit has no affect on priority tagged packets.

This is only used when the Egress Port Type is set as Hybrid.

R/W

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