LAN9312 Datasheet, PDF (80/458 Pages) SMSC Corporation – High Performance Two Port 10/100 Managed Ethernet Switch with 32-Bit Non-PCI CPU Interface

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
Insert Tag
N
[egress_port]
Y
Default VID
[ingress_port] ^Y
Un-tag Bit
N
Add Tag
VID = Default VID
[ingress_port]
Priority = Default Priority
[ingress_port]
Send Packet Untouched
Default VID
[ingress_port] ^Y
Un-tag Bit
N
Change Priority N
[egress_port]
Y
Modify Tag
VID = Default VID
[ingress_port]
Priority = Default Priority
[ingress_port]
Modify Tag
VID = Default VID
[ingress_port]
Priority = Unchanged
Received VID Y
Un-tag Bit
N
Change Tag N
[egress_port]
Y
Y Change VLAN ID N
[egress_port]
Y Change Priority N
[egress_port]
Modify Tag
VID = Default VID
[egress_port]
Priority = Default Priority
[egress_port]
Modify Tag
VID = Default VID
[egress_port]
Priority = Unchanged
Y Change Priority N
[egress_port]
Modify Tag
VID = Unchanged
Priority = Default Priority
[egress_port]
Send Packet Untouched
Strip Tag
Strip Tag
Special Tagged
Strip Tag
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 1.2 (04-08-08)
80
DATASHEET
SMSC LAN9312