PXF4333 Datasheet, PDF (207/361 Pages) Infineon Technologies AG – ABM 3G ATM Buf fer Manager

Register 36 TCT3
TCT Transfer Register 3
ABM-3G
PXF 4333 V1.1
Register Description
CPU Accessibility:
Reset Value:
Offset Address:
Typical Usage:
Read/Write
0000_H
TCT3
41_H
Written and Read by CPU to maintain the TCT table;
the meaning of register TCT3 depends on the bit field
’Word64Sel’ in WAR;
Register WAR.Word64Sel(1:0) =’00’:
Bit
15
14
13
12
11
DH(2:0)
unused
0
Bit
7
6
5
4
3
SCNT
0
GFRen
0
10
9
8
0
EPDen PPDen
2
1
0
unused(3:0)
DH
(2:0)
DeltaHysteresis for threshold evaluations with hysteresis applied:
This value is per traffic class, but is evaluated individually for each
effected threshold TH relative to the threshold size. The hysteresis
determines a lower threshold TL with
TL_i:= TH_i - Delta_i
The Delta_i value is determined by bit field DH(2:0) and TH_i
with:
Delta_i:= TH_i >> [DH(2:0) +1]
The following table shows the operation and resulting TL_i values for
the example of a threshold programmed to 256 cells:
DH(2:0):
0d
1d
2d
3d
Delta_i:=
0
TH_i >>2
TH_i >>3
TH_i >>4
(hysteresis disabled)
Example:
TL_i:= 256
TL_i:= 192
TL_i:= 224
TL_i:= 240
Data Sheet
207
2001-12-17