PXF4336 Datasheet, PDF (230/425 Pages) Infineon Technologies AG – ABM Premium ATM Buf fer Manager

QCIHYS(3:0)
ABM-P
PXF 4336 V1.1
Register Description
10
4k bits (queues 0..4095 are monitored)
11
8k bits (queues 0..8191 are monitored)
Queue Congestion Indication Hysteresis
This bit field determines the hysteresis that is applied to the Queue
Congestion Indication threshold evaluation. The queue specific
threshold is programmed in table QCIT.
The hysteresis determines a lower threshold TH_hys with
TH_hysi:= Threshold_i - Delta_i
The Delta_i value is determined by bit field DH(2:0) and Threshold_i
with:
Delta_i:= Threshold_i >> [QCIHYS(3:0)]
The following table shows the operation and resulting example
TH_hysi values for the example of a threshold programmed to 1024
cells:
QCIHYS Delta_i:=
(2:0):
Example:
0d
0
(hysteresis disabled) TH_hysi:= 1024
1d
Threshold_i >>1
TH_hysi:= 512
2d
Threshold_i >>2
TH_hysi:= 768
4d
Threshold_i >>4
TH_hysi:= 960
8d
Threshold_i >>8
TH_hysi:= 1020
10d
Threshold_i >>10
hysteresis ineffective)
Data Sheet
230
2001-12-17