LAN9312-NZW SMSC, LAN9312-NZW Datasheet - Page 67

• Manufacturer Part Number: LAN9312-NZW
• Description: Ethernet ICs Hi Per 2 Port 10/100 Ethernet Switch
• Manufacturer: SMSC
• Type: Two Port Managed Ethernet Switchr

Specifications of LAN9312-NZW

• Ethernet Connection Type: 10 Base-T, 100 Base-TX
• Minimum Operating Temperature: 0 C
• Mounting Style: SMD/SMT
• Product: Ethernet Switches
• Number Of Transceivers: 1
• Standard Supported: 802.3, 802.3u
• Data Rate: 10 Mbps, 100 Mbps
• Supply Voltage (max): 3.3 V
• Supply Voltage (min): 0 V
• Supply Current (max): 186 mA, 295 mA
• Maximum Operating Temperature: + 70 C
• Package / Case: TQFP-100
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

High Performance Two Port 10/100 Managed Ethernet Switch with 32-Bit Non-PCI CPU Interface
Datasheet
SMSC LAN9312
6.4.3
IPv4 Precedence
IPv4(TOS)
IPv6(TC)
VLAN Priority
Source Port
ALR Priority
Transmit Priority Queue Selection
The transmit priority queue may be selected from five options. As shown in
be based on:
The last four options listed are sent through the Traffic Class table which maps the selected priority to
one of the four output queues. The static value from the ALR table directly specifies the queue.
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
6b
3b
Packet is from Host
2b
VL Higher Priority
Packet is Tagged
3b
Use Precedence
DIFFSERV table
Packet is IPv 4
programmable
VLAN Enable
Packet is IP
programmable
programmable
Regeneration
port default
Figure 6.4 Switch Engine Transmit Queue Selection
per port
Priority
Use IP
2b
table
table
3b
3b
3b
DATASHEET
calculation
priority
67
DA Highest Priority
programmable
Traffic Class
ALR Static Bit
table
static DA
override
Figure
Revision 1.7 (06-29-10)
6.4, the priority may
2b
priority queue