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11.12 Idle (E3h/97h)
Com m and Block Output Registers
Register
7
6
5
Data
-
-
-
Feature
-
-
-
Sector Count
V
V
V
Sector
-
-
-
Number
Cylinder Low
-
-
-
Cylinder High
-
-
-
Device/Head
1
-
1
Command
1
1
1
Error Register
7
6
5
4
CRC UNC
0
IDN
0
0
0
0
Table 123 Idle Command (E3h/97h)
The Idle command causes the device to enter Idle mode immediately, and set auto power down timeout parameter
(standby timer). And then the timer starts counting down.
When the Idle mode is entered, the device is spun up to operating speed. If the device is already spinning, the s pin
up sequence is not executed.
During Idle mode the device is spinning and ready to respond to host commands immediately.
Output Parameters To The Device
Sector Count
Timeout Parameter. If zero, then the automatic power down sequence is disabled. If non-zero,
then the automatic power down sequence is enabled, and the timeout interval is shown below:
When the automatic power down sequence is enabled, the drive will enter Standby mode automatically if the timeout
interval expires with no drive access from the host. The timeout interval will be reinitialized if there is a drive access
before the timeout interval expires.
Com m and Block Input Registers
4
3
2
1
0
Register
-
-
-
-
-
Data
-
-
-
-
-
Error
V
V
V
V
V
Sector Count
-
-
-
-
-
Sector Number
-
-
-
-
-
Cylinder Low
-
-
-
-
-
Cylinder High
D
-
-
-
-
Device/Head
0
0
0
1
1
Status
3
2
1
0
0
ABT
T0N AMN
0
V
0
0
Western Digital Hard Disk Drive OEM Specification
7
6
5
-
-
-
...See Below ...
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
...See Below ...
Status Register
7
6
5
4
BSY RDY
DF
DSC DRQ COR
0
V
0
V
Value
----------
0
1-240
241-251
252
253
254
255
150
4
3
2
1
0
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
3
2
1
0
IDX
ERR
-
0
-
V
Description
-------------------------
Timer disabled
Value * 5
(Value-240) * 30 minutes
21 minutes
8 hours
Aborted
21 minutes 15 seconds
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