IBM DBCA-204860 Hard Drive Specifications - Page 149

Set Features

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12.26 Set Features (EFh) Command Block Output Registers Register 76543210 Data Feature VVVVVVVV Sector Count Note.1 Sector Number Cylinder Low Cylinder High Device/Head 1 1D Command 11101111 Command Block Input Registers Register 76543210 Data Error ...See Below... Sector Count Sector Number Cylinder Low Cylinder High Device/Head Status ...See Below... Error Register 76543210 CRC UNC 0 IDN 0 ABT T0N AMN 00000V00 Status Register 76543210 BSY RDY DF DSC DRQ COR IDX ERR 0V0 0 V Figure 95. Set Features Command (EFh) The Set Feature command establishes the following parameters which affect the execution of certain features as shown in below table. ABT will be set to 1 in the Error Register if the Feature register contains any undefined values. Output Parameters To The Device Feature Destination code for this command. 02H Enable write cache (Warning.1) 03H Set transfer mode based on value in sector count register 05H Enable Advanced Power Management 09H Enable Address Offset mode 44H 34 bytes of ECC apply on Read Long/Write Long commands 55H Disable read look-ahead feature 66H Disable reverting to power on defaults 82H Disable write cache 85H Disable Advanced Power Management 89H Disable Address Offset mode Command Descriptions 141

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12.26
Set Features
(EFh)
Command Block Output Registers
Command Block Input Registers
Register
76543210
Register
76543210
Data
Data
Feature
VVVVVVVV
Error
...See Below...
Sector Count
Note.1
Sector Count
Sector Number
Sector Number
Cylinder Low
Cylinder Low
Cylinder High
Cylinder High
Device/Head
1
1D
Device/Head
Command
11101111
Status
...See Below...
Error Register
Status Register
7
6
5
4
3
2
1
0
7
6
5
4
3
2
1
0
CRC UNC
0
IDN
0
ABT T0N AMN
BSY RDY DF
DSC DRQ COR IDX ERR
0
0
0
0
0
V
0
0
0
V
0
0
V
Figure 95. Set Features Command (EFh)
The Set Feature command establishes the following parameters which affect the execution of certain features
as shown in below table.
ABT will be set to 1 in the Error Register if the Feature register contains any undefined values.
Output Parameters To The Device
Feature
Destination code for this command.
02H
Enable write cache (Warning.1)
03H
Set transfer mode based on value in sector count register
05H
Enable Advanced Power Management
09H
Enable Address Offset mode
44H
34 bytes of ECC apply on Read Long/Write Long commands
55H
Disable read look-ahead feature
66H
Disable reverting to power on defaults
82H
Disable write cache
85H
Disable Advanced Power Management
89H
Disable Address Offset mode
Command Descriptions
141