![](http://datasheet.mmic.net.cn/330000/PM7329-BI_datasheet_16444382/PM7329-BI_157.png)
PM7329 S/UNI-APEX-1K800
DATASHEET
PMC-2010141
ISSUE 2
ATM TRAFFIC MANAGER AND SWITCH
PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC., AND FOR ITS CUSTOMERS’ INTERNAL USE
143
QShpNClass[1:0], N=0..3
Class that shaper N is associated with.
Warning
:
This register can only be modified during a port/class setup, and when the
queue engine is disabled.
QShpNMeasInt[3:0], N=0..3
Encoded value defining the number of clock cycles over which to measure
congestion levels for shaper N. The period defined is not affected by the
slow down factor. Encoding formula is 64 * 2^m.
This register has no effect if QShpNSlowDownEn = 0.
QShpNThrshVal[3:0], N=0..3
Defines a value for the class queue length threshold value. Used to select
whether to speed up or slow down the shaper N.
Effective value = 2
(T+1)
– 1, where T = QShpNThrshVal[3:0]
This register has no effect if QShpNSlowDownEn = 0 or QShpNThrshEn = 0.
QShpNRedFact[1:0], N=0..3
Encoded value for the slow down rate reduction factor. Controls how quickly
the shaper N speeds up. Low values will produce better fairness at the cost
of utilization.
QShpNRedFact[1:0]
Effective Value
0
2
1
4
2
8
3
16
This register has no effect if QShpNSlowDownEn = 0.
QShpNRTRate[8:0], N=0..3
Real time rate for shaper N. Represents the maximum shaped data rate,
calculated in the number of clock cycles per timeslot. The sum of all active
real time rate must be less than the link rate of 1.42Mcells/s. The table below
provides the decimal setting for various configurations: