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5.11 Idle (E3h/97h)
Table 37: Idle command (E3h/97h)
Command Block Output Registers
Register
Data
Feature
Sector Count
Sector Number
Cylinder Low
Cylinder High
Device/Head
Command
7
6
5
CRC UNC
0
0
0
0
The Idle command causes the device to enter Idle mode immediately and to set the auto power down time-out
parameter (standby timer). And the timer then starts counting down.
When the Idle mode is entered, the device is spun up to operating speed. If the device is already spinning, the spin
up sequence is not executed.
During Idle mode the device is spinning and is ready to respond to host commands immediately.
Output parameters to the device
Sector Count
7 6 5 4 3 2 1 0
- - - - - - - -
- - - - - - -
V V V V V V V V
- - - - - - - -
- - - - - - - -
- - - - - - - -
1 - 1 D - - - -
1 1 1 0 0 0 1 1
Error Register
4
3
2
1
IDN
0
ABT T0N AMN
0
0
V
0
Time-out Parameter. If it is zero, the automatic power down sequence is disabled. If it is
nonzero, the automatic power down sequence is enabled. The time-out interval is shown
below:
Value
0
1-240
241-251
252
253
254
255
When the automatic power down sequence is enabled, the drive will enter Standby mode
automatically if the time-out interval expires with no drive access from the host. The time-
out interval will be reinitialized if there is a drive access before the time-out interval
expires
Deskstar 7K500 Hard Disk Drive Serial ATA Addendum
Register
Data
Error
Sector Count
Sector Number
Cylinder Low
Cylinder High
Device/Head
Status
0
7
6
BSY RDY DF DSC DRQ
0
0
V
Time-out
Timer disabled
Value x 5
(Value-240) x 30 minutes
21 minutes
8 hours
21 minutes 10 seconds
21 minutes 15 seconds
72
Command Block Input Registers
7 6 5 4 3 2 1 0
- - - - - - - -
see below
- - - - - - - -
- - - - - - - -
- - - - - - - -
- - - - - - - -
- - - - - - - -
see below
Status Register
5
4
3
COR IDX
0
V
-
2
1
0
ERR
0
-
V
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