![](http://datasheet.mmic.net.cn/330000/PM73487-PI_datasheet_16444394/PM73487-PI_172.png)
PM73487 QRT
PMC-Sierra, Inc.
PMC-980618
Issue 3
622 Mbps ATMTraffic Management Device
Released
Datasheet
160
8.4.1
Transmit VO Control Block
Address base: 120000
h
(480000
h
byte)
Index:
1
h
Number of entries: A0
h
Type: Read/Write
8.4.1.1
TX_VO_CONFIG
Offset: 0
h
(0
h
byte)
Type: Read/Write
Index:
1
h
Number of entries: 31
Format: Refer to the following table.
Table 28. Transmit VO Control Block Summary
Byte
Offset
Long
Offset
Name
Read or
Write
Description
0-78
h
0-1E
h
TX_VO_CONFIG
R/W
VO configuration.
7C
h
1F
h
Not used
R/W
Write with a 0 to maintain software compatibility
with future versions.
80-F8
h
20-3E
h
TX_VO_STATE
R/W
VO state.
FC
h
3F
h
Not used
R/W
Write with a 0 to maintain software compatibility
with future versions.
100-178
h
40-5E
h
TX_VO_CELLS_PRES
R/W
Bit field of the SCs with cells present for each
VO.
17C
h
5F
h
Not used
R/W
Write with a 0 to maintain software compatibility
with future versions.
180-1F8
h
60-7E
h
TX_VO_SERVICE_STATE_0
R/W
State word 0 of the service algorithm for this VO.
1FC
h
7F
h
Not used
R/W
Write with a 0 to maintain software compatibility
with future versions.
200-278
h
80-9E
h
TX_VO_SERVICE_STATE_1
R/W
State word 1 of the service algorithm for this VO.
27C
h
9F
h
Not used
R/W
Write with a 0 to maintain software compatibility
with future versions.
Field (Bits)
Description
Not present
(31:16)
RAM is not present in these bit locations.
TX_VO_EXP_MAX_QD
(15:12)
Exponent of the maximum per-VO queue depth. Initialize to the proper setting. Limits
the TX_VO_CUR_QD to:
TX_VO_CUR_QD
≤
1 + 2
TX_VO_EXP_MAX_QD
A value of 0
h
causes all cells for this VO to be dropped. A value of F
h
limits this SC to
31744 cells.