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12.1 Check Power Mode (E5h/98h)
Table 86 Check Power Mode Command (E5h/98h)
Command Input
Field
Description
FEATURE
N/A
COUNT
N/A
LBA
N/A
DEVICE
Bit Description
7 Obsolete
6 N/A
5 Obsolete
4 Transport Dependent
3:0 Reserved
Command
7:0 E5h or 98h
Normal Outputs
Field
Description
ERROR
N/A
COUNT
Value
Description
00h
Device is in the:
-
PM2: Standby state and the EPC feature set is not enabled; or
-
PM2: Standby state, the EPC feature set is enabled, and the device is in
the Standby_z power condition.
01h
Device is in the:
-
PM2: Standby state, the EPC feature set is enabled, and the device is in
the Standby_y power condition.
02h..3Fh
Reserved
40h..41h
Obsolete
42h..7Fh
Reserved
80h
Device is in the:
-
PM1: Idle state and EPC feature set is not supported; or
-
PM1: Idle state and EPC feature set is supported and the EPC feature set
is disabled.
81h
Device is in the:
-
PM1: Idle state, the EPC feature set is enabled, and the device is in the
Idle_a power condition.
82h
Device is in the:
-
PM1: Idle state, the EPC feature set is enabled, and the device is in the
Idle_b power condition.
83h
Device is in the:
-
PM1: Idle state, the EPC feature set is enabled, and the device is in the
Idle_c power condition
84h..FEh
Reserved
FFh
Device is in the:
-
PM0: Active state or
-
PM1: Idle state.
LBA
If the LOW POWER STANDBY SUPPORTED bit is set to one, then this field is as described in
this table. Otherwise, this field is N/A.
Bit
Description
27:20
Device is waiting to enter a lower power condition:
Value Description
00h Standby_z
01h Standby_y
02h..80h Reserved
138
Hard Disk Drive Specification