Set Features (Efh); Figure 118. Set Features Command (Efh) - IBM DTLA-305040 - Deskstar 41.1 GB Hard Drive Specifications
3.5 inch ultra ata/100 hard disk drive
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12.28 Set Features (EFh)
Command Block Output
Registers
Register
Data
Feature
Sector Count
Sector Number
Cylinder Low
Cylinder High
Device/Head
Command
Error Register
7
6
5
CRC
UNC
0
0
0
0
Figure 118. Set Features Command (EFh)
The Set Feature command is to establish 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
7 6 5 4 3 2 1 0
- - - - - - - -
V V V V V V V V
Note 1
- - - - - - - -
- - - - - - - -
- - - - - - - -
1 - 1 D - - - -
1 1 1 0 1 1 1 1
4
3
2
1
IDN
0
ABT
T0N
AMN
0
0
V
0
Destination code for this command.
02H Enable write cache
03H Set transfer mode based on value in sector count register
05H Enable Advanced Power Management
06H Enable Power-up in Standby feature set
07H Power-up in Standby feature set device spin-up
09H Enable Address Offset mode
42H Enable Automatic Acoustic Management
44H 40 bytes of ECC apply on Read Long/Write Long commands
55H Disable read look-ahead feature
Deskstar 40GV & 75GXP hard disk drive specifications
Command Block Input
Register
Data
Error
Sector Count
Sector Number
Cylinder Low
Cylinder High
Device/Head
Status
Status Register
0
7
6
5
BSY
RDY
DF
0
0
V
0
154
Registers
7 6 5 4 3 2 1 0
- - - - - - - -
see below
- - - - - - - -
- - - - - - - -
- - - - - - - -
- - - - - - - -
- - - - - - - -
see below
4
3
2
1
DSC
DRQ
COR
IDX
–
–
0
–
0
ERR
V
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