High Performance Two Port 10/100 Managed Ethernet Switch with 32-Bit Non-PCI CPU Interface
Datasheet
The transmit queue priority is based on the packet type and device configuration as shown in
Figure 6.5. Refer to Section 14.5.3.16, "Switch Engine Global Ingress Configuration Register
(SWE_GLOBAL_INGRSS_CFG)," on page 384 for definitions of the configuration bits.
Get Queue
Y
Packet from Host
N
DA Highest
Priority
N
Y
wait for ALR result
Y
N
ALR Static Bit
N
VL Higher
Priority
Y
VLAN Enable &
Packet is
Y
Tagged
N
Y
Packet is IPv4/v6
& Use IP
N
VLAN Enable &
Packet is
Tagged
Y
Y
Packet is IPv 4
N
N
Y
N
Use Precedence
Resolved Priority =
Default Priority[Source
Port]
Resolved Priority =
Priority Regen[VLAN
Priority]
Resolved Priority =
IP Precedence
Resolved Priority =
DIFFSERV[TOS]
Resolved Priority =
DIFFSERV[TC]
Queue =
Queue =
ALR Priority
Traffic Class[Resolved Priority]
Get Queue Done
Figure 6.5 Switch Engine Transmit Queue Calculation
Revision 1.2 (04-08-08)
SMSC LAN9312
DATA6S8HEET
SMSC [ SMSC CORPORATION ]
