6. ATA Command Specification
NOP
SONY AIT-1 Turbo drive SDX-470V series Ver.1.0
6-18
6.7. NOP
(00h)
The device shall respond with command aborted. For devices implementing the Overlapped feature set,
subcommand code 00h in the Features register shall abort any outstanding queue. Subcommand codes 01h
through FFh in the Features register shall not affect the status of any outstanding queue.
Inputs
Register
7 6 5 4 3 2 1 0
Features
na
Sector Count
na
Sector Number
na
Cylinder Low
na
Cylinder High
na
Device/Head
1 na 1 DEV
na na na na
Command
00h
Device/Head register -
DEV indicates the selected device.
Normal outputs
This command always fails with an error.
Error outputs
The Command Block registers, other than the Error and Status register, are not changed by this command. This
command always fails with the device setting the ABRT bit to one.
Register
7 6 5 4 3 2 1 0
Error
na ABRT
na
Sector Count
Initial value
Sector Number
Initial value
Cylinder Low
Initial value
Cylinder High
Initial value
Device/Head
Initial value
Status
BSY DRDY DF DSC DRQ na na CHK
Error register -
ABRT is set to one.
Sector Count, Sector Number, Cylinder Low, Cylinder High, Device/Head resisters-
Value set by host is not changed.
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.
Prerequisites
DRDY set equal to one.
Description
This command enables a host that only performs 16-bit register accesses, to check device status. The Sony
ATAPI Drive responds, as it does to an unrecognized command, by setting ABRT bit to one in the Error register,
CHK in the Status register, clearing BSY to zero in the Status register, and asserting INTRQ.
Содержание AIT-SDX470
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