zl50409 Zarlink Semiconductor, zl50409 Datasheet - Page 38

• Manufacturer Part Number: zl50409
• Description: Managed 9-port 10/100m Ethernet Switch
• Manufacturer: Zarlink Semiconductor

5.8
Figure 9 shows the ZL50409 priority classification rule.
5.9
The ZL50409 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 ZL50409 for port-based VLAN (see “Register
Definition” on page 61). 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 ZL50409 determines the VLAN membership of
each packet by noting the port on which it arrives. From there, the ZL50409 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.
ZL50409
Yes
38
Yes
No
Yes
Use Default port settings
Use logical port
Use Logical Port?
IP Frame?
Yes
Yes
No
Use TOS
Data Sheet