PXF4336 Datasheet, PDF (220/425 Pages) Infineon Technologies AG – ABM Premium ATM Buf fer Manager

7.2.7 Backpressure Control Registers
ABM-P
PXF 4336 V1.1
Register Description
Register 21 UUBPTH0
Upstream UTOPIA Backpressure Threshold Register 0
•
CPU Accessibility:
Reset Value:
Offset Address:
Typical Usage:
Read/Write
FFFF_H
UUBPTH0
2C_H
Written by CPU
Bit
15
14
13
12
11
10
9
8
UUBPTH0(17:10)
Bit
7
6
5
4
3
2
1
0
UUBPTH0(9:2)
•
UUBPTH0(17:2)
Upstream UTOPIA Backpressure Threshold 0
This bit field determines the backpressure threshold for the
Upstream UTOPIA Receive Interface Group 0 (see Chapter 5.1.1)
with a granularity of 4 cells.
The CPU programs the threshold with a granularity of 4 by right
shifting the value by 2:
UUBPTH0(17:2):= (maximum_cells(17:0) >> 2)
Data Sheet
220
2001-12-17