zl50405 Zarlink Semiconductor, zl50405 Datasheet - Page 38

• Manufacturer Part Number: zl50405
• Description: Managed5-port 10/100 M Ethernet Switch
• Manufacturer: Zarlink Semiconductor

5.8
Figure 9 shows the ZL50405 priority classification rule.
5.9
The ZL50405 supports two models for determining and controlling how a packet gets assigned to a VLAN: port
priority and tag -based VLAN.
5.9.1
An administrator can use the PVMAP Registers to configure the ZL50405 for port-based VLAN (see “Register
Definition” on page 59). 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 ZL50405 determines the VLAN membership of
each packet by noting the port on which it arrives. From there, the ZL50405 determines which outgoing port(s)
is/are eligible to transmit each packet, or whether the packet should be discarded.
Priority Classification Rule
Port and Tag Based VLAN
Use VLAN
priority
Port-Based VLAN
Yes
TOS Precedence over VLAN?
Use Default port settings
(QOSC Register bit 5)
Fix Port Priority?
Figure 9 - Priority Classification Rule
VLAN Tag?
IP Frame?
No
No
No
No
Zarlink Semiconductor Inc.
ZL50405
Yes
38
Yes
No
Yes
Use Default port settings
Use logical port
Use Logical Port?
IP Frame?
Yes
Yes
No
Use TOS
Data Sheet