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6. ATA Command Specification
6.10. Set Features (EFh)
This command is used by the host to establish parameters that affect the execution of certain device features. The
following table defines these features.
Inputs
Register
Features
Sector Count
Sector Number
Cylinder Low
Cylinder High
Device/Head
Command
Table 6-4: SET FEATURES Register Definitions defines the value of the subcommand in the Feature register.
Some subcommands use other registers, such as the Sector Count register, to pass additional information to the
Sony ATAPI Drive.
Device/Head register -
DEV indicates the selected device.
Normal outputs
See the subcommand descriptions.
Error outputs
Register
Error
Sector Count
Sector Number
Cylinder Low
Cylinder High
Device/Head
Status
If any subcommand input value is not supported or is invalid, the Sony ATAPI Drive sets the ABRT bit to one.
Error register -
ABRT is set to one if this subcommand is not supported or if value is invalid.
Device/Head register -
DEV indicates the selected device.
Status register -
BSY is cleared to zero when the command is completed.
DRDY is set to one.
DF is set to one if a device fault has occurred.
DSC is set to one.
DRQ is cleared to zero.
CHK is set to one if an Error register bit is set to one.
Prerequisites
DRDY set equal to one.
Description
This command is used by the host to establish parameters that affect the execution of certain device features.
Table 6-4: SET FEATURES Register Definitions defines these features. At power on, or after a hardware reset,
the default setting of the functions specified by the subcommands are vendor specific.
6-24
7
6
5
1
na
1
7
6
5
na
1
na
1
BSY
DRDY
DF
4
3
2
Subcommand code
Subcommand specific
Subcommand specific
Subcommand specific
Subcommand specific
DEV
na
EFh
4
3
2
ABRT
na
na
na
na
DEV
DSC
DRQ
na
SONY AIT-2 Turbo drive SDX-560V series Ver.1.0
Set Features
1
0
na
na
na
1
0
na
na
na
CHK
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