Nop (00H) - Sony AIT-SDX460 Product Specifications Manual

6. ATA Command Specification
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
Features
Sector Count
Sector Number
Cylinder Low
Cylinder High
Device/Head
Command
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
Error
Sector Count
Sector Number
Cylinder Low
Cylinder High
Device/Head
Status
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.
6-18
7 6 5
1 na 1
7 6 5
na
BSY DRDY DF
4 3 2
na
na
na
na
na
DEV na na
00h
4 3 2
ABRT
Initial value
Initial value
Initial value
Initial value
Initial value
DSC DRQ na
SONY AIT-1 Turbo drive SDX-460V series Ver.1.0
Idle Immediate
1 0
na na
1 0
na
na CHK