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6. ATA Command Specification
6.1.
Check Power Mode (E5h)
The CHECK POWER MODE command allows the host to determine the current power mode of the device. The
CHECK POWER MODE command shall not cause the device to change power or affect the operation of the
Standby timer.
Inputs
Register
Features
Sector Count
Sector Number
Cylinder Low
Cylinder High
Device/Head
Command
Note: na indicates the content of a bit of field is not applicable to the particular command.
Device/Head register -
DEV indicates the selected device. When the DEV bit is equal to zero, Device 0 (master) is selected.
When the DEV bit is equal to one, Device 1 (slave) is selected.
Normal outputs
Register
Error
Sector Count
Sector Number
Cylinder Low
Cylinder High
Device/Head
Status
Status register -
BSY is cleared to zero indicating the command is completed.
DRDY is set to one.
DF is cleared to zero.
DSC is set to one.
DRQ is cleared to zero.
CHK is cleared to zero.
Sector Count register -
Result value:
00h - device is in Standby mode.
80h - device is in Idle mode.
FFh - device is in Active mode.
Error outputs
Register
Error
Sector Count
Sector Number
Cylinder Low
Cylinder High
Device/Head
Status
6-2
7
6
5
1
na
1
7
6
5
1
na
1
BSY
DRDY
DF
7
6
5
na
1
na
1
BSY
DRDY
DF
4
3
2
na
na
na
na
na
DEV
na
na
E5h
4
3
2
na
Result value
na
na
na
DEV
na
na
DSC
DRQ
na
4
3
2
ABRT
na
na
na
na
DEV
DSC
DRQ
na
SONY AIT-2 Turbo drive SDX-570V series Ver.1.0
Check Power Mode
1
0
na
na
1
0
na
na
na
CHK
1
0
na
na
na
CHK
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