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Execute Device Diagnostics
6.3.
Execute Device Diagnostics (90h)
This command shall perform the internal diagnostic tests implemented by the device. The DEV bit in the
Device/Head register is ignored. Both devices, if present, shall execute this command regardless of which device
is selected. If the host issues an EXECUTE DEVICE DIAGNOSTIC command while a device is in or going to a
power management mode except Sleep, then the device shall execute the EXECUTE DEVICE DIAGNOSTIC
sequence.
Inputs
Register
Features
Sector Count
Sector Number
Cylinder Low
Cylinder High
Device/Head
Command
The DEV bit in the Device/Head register is ignored.
Normal outputs
Register
Error
Sector Count
Sector Number
Cylinder Low
Cylinder High
Device/Head
Status
The diagnostic code written into the Error register is an 8-bit code. Table 6-2: Diagnostic Codes defines these
values.
Error register -
Diagnostic code.
Device/Head register -
DEV indicates the selected device.
Status register -
BSY is cleared to zero, indicating the command is completed.
DRDY is cleared to zero.
DF is cleared to zero.
DSC is cleared to zero.
DRQ is cleared to zero.
CHK is cleared to zero.
SONY AIT-1 Turbo drive SDX-460V series Ver.1.0
7
6
5
1
na
1
7
6
5
1
na
1
BSY
DRDY
DF
6. ATA Command Specification
4
3
2
na
na
na
na
na
DEV
na
na
90h
4
3
2
Diagnostic code
01h
01h
14h
EBh
DEV
na
na
DSC
DRQ
0
1
0
na
na
1
0
na
na
na
CHK
6-5
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