LAN9303MI-AKZE Standard Microsystems (SMSC), LAN9303MI-AKZE Datasheet - Page 78

• Manufacturer Part Number: LAN9303MI-AKZE
• Manufacturer: Standard Microsystems (SMSC)

Specifications of LAN9303MI-AKZE

• Lead Free Status / Rohs Status: Compliant

Revision 1.4 (07-07-10)
6.4.3
IPv4 Precedence
IPv4(TOS)
IPv6(TC)
VLAN Priority
Source Port
ALR Priority
Note: For the last three cases, if the VID is not in the VLAN table, the VLAN is considered foreign
Transmit Priority Queue Selection
The transmit priority queue may be selected from five options. As shown in
be based on:
All options are sent through the Traffic Class table which maps the selected priority to one of the four
output queues.
6b
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
3b
Packet is from Host
2b
VL Higher Priority
Packet is Tagged
3b
Use Precedence
and the membership result is NULL. A NULL membership will result in the packet being filtered
if Enable Membership Checking is set. A NULL membership will also result in the packet being
filtered if the destination address is not found in the ALR table (since the packet would have
no destinations).
Packet is IPv4
programmable
DiffServ table
Packet is IP
programmable
programmable
Regeneration
port default
Use Tag
per port
Priority
Use IP
3b
table
table
Figure 6.4 Switch Engine Transmit Queue Selection
3b
3b
3b
Small Form Factor Three Port 10/100 Managed Ethernet Switch with Dual MII/RMII/Turbo MII
DATASHEET
calculation
priority
ALR Priority Enable Bit
DA Highest Priority
78
static DA
override
programmable
Traffic Class
table
SMSC LAN9303M/LAN9303Mi
Figure
6.4, the priority may
2b
priority queue
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