Two Port 10/100 Managed Ethernet Switch with 16-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 385 for definitions of the configuration bits.

Y

Packet is IPv 4

 

 

 

 

N

 

 

Y Use Precedence N

Get Queue

 

 

 

 

Y

 

Packet from Host

 

 

 

 

N

 

 

 

 

 

DA Highest

N

 

Priority

 

 

 

Y

 

 

 

 

 

wait for ALR result

YALR Static Bit

N

NVL Higher

Priority

 

Y

 

 

 

VLAN Enable &

Y

Packet is

 

Tagged

 

 

N

 

 

 

 

 

 

YPacket is IPv 4/v6

&Use IP

 

N

 

VLAN Enable &

Y

Packet is

 

Tagged

 

 

N

 

 

 

 

 

 

Resolved Priority =

 

Resolved Priority =

 

Resolved Priority =

 

Resolved Priority =

 

Resolved Priority =

 

 

 

Default Priority[Source

 

Priority Regen[VLAN

IP Precedence

 

DIFFSERV[TOS]

 

DIFFSERV[TC]

 

 

 

 

 

Port]

 

Priority]

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Queue =

 

 

Queue =

ALR Priority

 

 

Traffic Class[Resolved Priority]

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Get Queue Done

Figure 6.5 Switch Engine Transmit Queue Calculation

Revision 1.4 (08-19-08)

68

SMSC LAN9311/LAN9311i

 

DATASHEET