zl50416 Zarlink Semiconductor, zl50416 Datasheet - Page 85

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

13.9.32
I
Accessed by CPU, Serial Interface and I
13.9.33
The ZL50416 supports classifying packet priority through layer 4 logical port information. It can be setup by 8 Well
Known Ports, 8 User Defined Logical Ports, and 1 User Defined Range.
The 8 Well Known Ports supported are:
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Their respective priority can be programmed via Well_Known_Port [7:0] priority register. Well_Known_Port_
Enable can individually turn on/off each Well Known Port if desired.
Similarly, the User Defined Logical Port provides the user programmability to the priority, plus the flexibility to select
specific logical ports to fit the applications. The 8 User Logical Ports can be programmed via User_Port 0-7
registers. Two registers are required to be programmed for the logical port number. The respective priority can be
programmed to the User_Port [7:0] priority register. The port priority can be individually enabled/disabled via
User_Port_Enable register.
The User Defined Range provides a range of logical port numbers with the same priority level. Programming is
similar to the User Defined Logical Port. Instead of programming a fixed port number, an upper and lower limit need
to be programmed, they are: {RHIGHH, RHIGHL} and {RLOWH, RLOWL} respectively. If the value in the upper
limit is smaller or equal to the lower limit, the function is disabled. Any IP packet with a logical port that is less than
the upper limit and more than the lower limit will use the priority specified in RPRIORITY.
2
C Address 0FC, CPU Address 554
0:23
1:512
2:6000
3:443
4:111
5:22555
6:22
7:554
Bits[3:0]:
See Programming QoS Registers application note for more information
Bits [7:4]:
Bits[3:0]:
See Programming QoS Registers application note for more information
RDRC1 – WRED Rate Control 1
User Defined Logical Ports and Well Known Ports
7
Z Rate
Corresponds to the frame drop percentage Y% for WRED. Granularity
6.25%.
Corresponds to the frame drop percentage Z% for WRED. Granularity
6.25%.
Corresponds to the best effort frame drop percentage B%, when shared pool
is all in use and destination port best effort queue reaches UCC. Granularity
6.25%.
4
2
C (R/W)
3
B Rate
Zarlink Semiconductor Inc.
ZL50416
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Data Sheet