SMSC LAN9312 manual 80

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

Datasheet

Hybrid tagging is summarized in Figure 6.9.

Receive Tag

Type

Non-tagged

Normal Tagged

Priority Tagged

Special Tagged

Insert Tag

N

Default VID

Y

[ingress_port]

[egress_port]

Un-tag Bit

Y

N

Default VID

Y

Change Priority

N

[ingress_port]

Un-tag Bit

[egress_port]

N

Y

Add Tag

Modify Tag

Modify Tag

VID = Default VID

VID = Default VID

Send Packet Untouched

VID = Default VID

Strip Tag

Strip Tag

[ingress_port]

[ingress_port]

[ingress_port]

Priority = Default Priority

Priority = Default Priority

Priority = Unchanged

[ingress_port]

[ingress_port]

Received VID

Y

Un-tag Bit

N

Change Tag

N

[egress_port]

Y

Y

Change VLAN ID N

[egress_port]

Y

Change Priority N

Y Change Priority N

[egress_port]

[egress_port]

Modify Tag

Modify Tag

Modify Tag

VID = Default VID

VID = Default VID

VID = Unchanged

[egress_port]

[egress_port]

Priority = Default Priority

Send Packet Untouched

Strip Tag

Priority = Default Priority

Priority = Unchanged

[egress_port]

[egress_port]

Figure 6.9 Hybrid Port Tagging and Un-tagging

The default VLAN ID and priority of each port may be configured via the following registers:

„Buffer Manager Port 0 Default VLAN ID and Priority Register (BM_VLAN_MII)

„Buffer Manager Port 1 Default VLAN ID and Priority Register (BM_VLAN_1)

„Buffer Manager Port 2 Default VLAN ID and Priority Register (BM_VLAN_2)

Revision 1.4 (08-19-08)	80	SMSC LAN9312
	DATASHEET