IBM DTTA-351010 Hard Drive Specifications - Page 149

Set Features

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12.27 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 109. 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 Destination code for this command. 02H Enable write cache 03H Set transfer mode based on value in sector count register 44H 34 bytes of ECC apply on Read Long/Write Long commands 55H Disable read look-ahead feature 5DH Enable release interrupt 66H Disable reverting to power on defaults 82H Disable write cache AAH Enable read look-ahead feature BBH 4 bytes of ECC apply on Read Long/Write Long commands CCH Enable reverting to power on defaults Command Descriptions 141

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12.27
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 109. Set Features Command (EFh)
The Set Feature command is to establish the following parameters which affect the execution of certain fea-
tures 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
03H
Set transfer mode based on value in sector count register
44H
34 bytes of ECC apply on Read Long/Write Long commands
55H
Disable read look-ahead feature
5DH
Enable release interrupt
66H
Disable reverting to power on defaults
82H
Disable write cache
AAH
Enable read look-ahead feature
BBH
4 bytes of ECC apply on Read Long/Write Long commands
CCH
Enable reverting to power on defaults
Command Descriptions
141