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Standby (E2h/96h)
Command Block Output Registers
Command Block Input Registers
Register
7
6
5
4
3
2
1
0
Register
7
6
5
4
3
2
1
0
Data
-
-
-
-
-
-
-
-
Data
-
-
-
-
-
-
-
-
Feature
-
-
-
-
-
-
-
-
Error
…See Below…
Sector Count
V
V
V
V
V
V
V
V
Sector Count
-
-
-
-
-
-
-
-
Sector Number
-
-
-
-
-
-
-
-
Sector Number
-
-
-
-
-
-
-
-
Cylinder Low
-
-
-
-
-
-
-
-
Cylinder Low
-
-
-
-
-
-
-
-
Cylinder High
-
-
-
-
-
-
-
-
Cylinder High
-
-
-
-
-
-
-
-
Device/Head
1
-
1
D
-
-
-
-
Device/Head
-
-
-
-
-
-
-
-
Command
1
1
1
0
0
0
1
0
Status
…See Below…
Error Register
Status Register
7
6
5
4
3
2
1
0
7
6
5
4
3
2
1
0
CRC UNC
0
IDN
0
ABT T0N AMN
BSY RDY
DF
DSC DRQ COR IDX ERR
0
0
0
0
0
V
0
0
0
V
0
V
-
0
-
V
Table 246 Standby Command (E2h/96h)
The Standby command causes the device to enter the Standby Mode immediately, and set auto power down
timeout parameter (standby timer).
When the Standby mode is entered, the drive is spun down but the interface remains active. If the drive is already
spun down, the spin down sequence is not executed.
During the Standby mode the device will respond to commands, but there is a delay while waiting for the spindle to
reach operating speed.
The automatic power down sequence is enabled and the timer starts counting down when the drive returns to Idle
mode.
If the EPC feature set is enabled, device enters into the Standby_Z power condition.
Output Parameters To The Device
Sector Count
Timeout Parameter. If zero, the timeout interval (Standby Timer) is NOT disabled. If non-zero,
then the automatic power down sequence is enabled, and the timeout interval is shown blow:
Value
Description
------------
-------------------------------
0
Timer disabled
1-240
Value * 5 seconds
241-251
(Value-240) * 30 minutes
252
21 minutes
253
8 hours
254
Aborted
255
21 minutes 15 seconds
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.
296
Western Digital Ultrastar DC HC310 SATA Product Manual