LAN9353 Datasheet, PDF (211/523 Pages) Microchip Technology – Interfaces at up to 200Mbps via Turbo MII

LAN9353
All options are sent through the Traffic Class table which maps the selected priority to one of the four output queues.
FIGURE 10-2:
SWITCH ENGINE TRANSMIT QUEUE SELECTION
Packet is Broadcast
Packet is from Host
Packet is Tagged
Packet is IPv4
Packet is IP
VL Higher Priority
Use Precedence
Use IP
Use Tag
IPv4(TOS)
IPv6(TC)
6b _Programmable
DiffServ Table
IPv4 Precedence
Source Port
VLAN Priority
ALR Priority
3b
2b
3b
Programmable
Port Default
Table
Programmable
Port Default BC
Table
Programmable
Priority
Regeneration
Table
per Port
3b
3b
3b
3b
3b
Priority
Calculation
Static DA
Override
DA Highest Priority
ALR Priority Enable Bit
Programmable
Traffic Class
Table
2b
Priority Queue
The transmit queue priority is based on the packet type and device configuration as shown in Figure 10-3. Refer to Sec-
tion 10.7.3.17, "Switch Engine Global Ingress Configuration Register (SWE_GLOBAL_INGRSS_CFG)," on page 304
for definitions of the configuration bits.
 2015 Microchip Technology Inc.
DS00001925A-page 211