zl50416 Zarlink Semiconductor, zl50416 Datasheet - Page 24

• Manufacturer Part Number: zl50416
• Description: Managed 16-port 10/100 M + 2-port 1 G Ethernet Switch
• Manufacturer: Zarlink Semiconductor

•
5.6
Figure 8 shows the ZL50416 priority classification rule.
5.7
The ZL50416 supports two models for determining and controlling how a packet gets assigned to a VLAN: port
priority and tag -based VLAN.
5.7.1
An administrator can use the PVMAP Registers to configure the ZL50416 for port-based VLAN (see “Registration
Definition” on page 42). For example, ports 1-3 might be assigned to the Marketing VLAN, ports 4-6 to the
Engineering VLAN, and ports 7-9 to the Administrative VLAN. The ZL50416 determines the VLAN membership of
each packet by noting the port on which it arrives. From there, the ZL50416 determines which outgoing port(s)
is/are eligible to transmit each packet, or whether the packet should be discarded.
In a logical port-based set up, a logical port provides the application information of the packet. Certain
applications are more sensitive to delays than others; using logical ports to classify packets can help speed
up delay sensitive applications, such as VoIP.
Priority Classification Rule
Port and Tag Based VLAN
Port-Based VLAN
Use Default Port Settings
Port Registers
Register for Port #0
PVMAP00_0[7:0] to PVMAP00_1[7:0]
Register for Port #1
PVMAP01_0[7:0] to PVMAP01_1[7:0]
IP
No
Yes
Table 4 - Port-Based VLAN
No
Figure 8 - Priority Classification Rule
TOS Precedence over VLAN?
(FCR Register, Bit 7)
Fix Port Priority ?
Use VLAN Priority
Zarlink Semiconductor Inc.
VLAN Tag ?
ZL50416
No
Yes
No
24
15
0
0
Destination Port Numbers Bit Map
…
Use Logical Port
No
Yes
Use Logical Port
Yes
Yes
Yes
IP Frame ?
2
1
1
Use Default Port Settings
No
1
1
1
Use TOS
0
0
1
Data Sheet