LAN9353 Datasheet, PDF (225/523 Pages) Microchip Technology – Interfaces at up to 200Mbps via Turbo MII

Hybrid tagging is summarized in Figure 10-7.
FIGURE 10-7:
HYBRID PORT TAGGING AND UN-TAGGING
LAN9353
Receive Tag
Type
Non-tagged
Normal Tagged Priority Tagged
Insert Tag
N
[egress_port]
Y
Default VID
[ingress_port]
Y
Un-tag Bit
N
Default VID
[ingress_port]
Y
Un-tag Bit
N
Add Tag
VID = Default VID
[ingress_port or egress port*]
Priority = ingress priority or
Default Priority
[egress_port]*
*choosen by VID /
Priority Select bit
Send Packet Untouched
Change Priority N
[egress_port]
Y
Modify Tag
VID = Default VID
[ingress_port or egress port*]
Priority = ingress priority or
Default Priority [egress_port]*
*choosen by VID /
Priority Select bit
Modify Tag
VID = Default VID
[ingress_port or egress port*]
Priority = Unchanged
*choosen by VID /
Priority Select bit
Received VID Y
Un-tag Bit
N
Change Tag N
[egress_port]
Y
Y Change VLAN ID N
[egress_port]
Strip Tag
Y Change Priority N
[egress_port]
Y Change Priority N
[egress_port]
Modify Tag
VID = Default VID [ingress
port or egress_port*]
Priority = ingress priority or
Default Priority
[egress_port]*
*choosen by VID /
Priority Select bit
Modify Tag
VID = Default VID [ingress
port or egress_port*]
Priority = Unchanged
*choosen by VID /
Priority Select bit
Modify Tag
VID = Unchanged
Priority = ingress priority or
Default Priority
[egress_port]*
*choosen by VID /
Priority Select bit
Send Packet Untouched
Strip Tag
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_0)
• 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)
Special Tagged
Strip Tag
 2015 Microchip Technology Inc.
DS00001925A-page 225