LAN9303MI-AKZE Datasheet, PDF (85/386 Pages) SMSC Corporation – Small Form Factor Three Port 10/100 Managed Ethernet Switch with Dual MII/RMII/Turbo MII

Small Form Factor Three Port 10/100 Managed Ethernet Switch with Dual MII/RMII/Turbo MII
Datasheet
6.4.6.1
Ingress Flow Calculation
Based on the flow monitoring mode, an ingress flow definition can include the ingress priority. This is
calculated similarly to the transmit queue with the exception that the Traffic Class table is not used. As
shown in Figure 6.7, the priority can be based on:
„ The static value for the destination address in the ALR table.
„ The precedence bits in the IPv4 TOS octet
„ The DIFFSERV mapping table indexed by the IPv4 TOS octet or the IPv6 Traffic Class octet
„ The VLAN tag priority field using the per port Priority Regeneration table
„ The port default
IPv4( TOS)
IPv6( TC)
Packet is from Host
Packet is Tagged
Packet is IPv4
Packet is IP
VL Higher Priority
Use Precedence
Use IP
Use Tag
6b
Programmable
3b
DIFFSERV Table
3b
IPv4 Precedence
3b
2b
Source Port
Programmable
Port Default
Table
Priority
Calculation
3b
Static DA
Override
3b
flow priority
VLAN Priority
ALR Priority
Programmable
Priority
Regeneration
Table per Port
DA Highest Priority
ALR Priority Enable Bit
Figure 6.7 Switch Engine Ingress Flow Priority Selection
SMSC LAN9303M/LAN9303Mi
85
DATASHEET
Revision 1.5 (07-08-11)