PXB4330 Datasheet, PDF (96/201 Pages) Infineon Technologies AG – ICs for Communications

PXB 4330
Register WAR.DwordSel(1:0) = ’01’:
Register Descriptions
Bit
15
14
13
12
11
10
9
8
QueueMaxEPD(7:0)
Bit
7
6
5
4
3
2
1
0
QueueCiCLP1(7:0)
QueueMax
EPD(7:0)
Combined Threshold for each Queue of this Traffic Class for
the following cases:
a) if EPDen=1
⇒ EPD queue threshold on a connection (LCI) basis for
CLP=0/1 frames
(frames with CLP=0 or 01 are discarded)
b) if EPDen=0
⇒ Maximum queue fill threshold for CLP=0/1 cells
(cells with CLP=0 or 1 are discarded as the maximum queue
fill for CLP=0/1 cells was exceeded)
The threshold is defined with a granularity of 64:
Threshold = QueueMaxEPD(7:0) * 64 Cells
(This is the high watermark of GFR)
QueueCiCLP1
(7:0)
Combined Queue Threshold of this Traffic Class for the
following cases:
a) if ABRen=1 for the traffic class
⇒ ABR Congestion Indication CI/EFCI is triggered
b) if CLPT=0 (CLP transparent bit is not true) and EPDen=0
⇒ CLP1 queue threshold for CLP=1 cells
(cells with CLP=1 are discarded)
c) if CLPT=0 and EPDen=1
⇒ EPD GFR queue threshold. If that threshold and additionally
BufNrtEPD (of the respective traffic class) is exceeded then
EPD is triggered.
The threshold is defined with a granularity of 4:
Threshold = QueueCiCLP1(7:0) * 4 Cells
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Data Sheet
6-96
09.99