K6610170
Rev.2
Dec 22, 2004
- 73 -
7.5.12. Idle Immediate [95h,E1h] / Unload Immediate [E1h]
Default Function:
Task
File
Registers
7 6 5 4 3 2 1 0
Command
95h or E1h
LBA High
XX
LBA Mid
XX
LBA Low
XX
Device/Head
X X X
DRV
X X X X
Sector Count
XX
Features
XX
Unload Feature (Unload Immediate Command):
Task
File
Registers
7 6 5 4 3 2 1 0
Command E1h
LBA High
55h
LBA Mid
4Eh
LBA Low
4Ch
Device/Head
X X X
DRV
X X X X
Sector Count
00h
Features
44h
Default function:
The IDLE IMMEDIATE command allows the host to immediately place the device in the Active Idle mode.
The device clears BSY and generates an interrupt after transition to active idle mode.
Unload Feature (Unload Immediate Command):
The device retracts the heads onto the ramp position as soon as receiving the UNLOAD FEATURE of the
IDLE IMMEDIATE command. INTRQ is asserted and BSY is cleared after the heads are completely
retracted onto the ramp position and latched. The time to complete the unload operation is typically within
500 milliseconds of receiving the command. The unload controlling method by the Unload Feature of the
Idle Immediate command is the same as that by power mode transition, and does not effect the
specification of normal load/unload times per device life.
The device stops read look-ahead operation if it is in process. If the device is performing a write operation,
the device suspends writing cached data onto the media as soon as possible. And the device keeps
unwritten sectors stored in the cache buffer until receiving a Software Reset, a Hardware Reset, or a any
new command except IDLE IMMEDIATE with Unload Feature (Unload Immediate Command).
After completion of this command, the device stays at Low Power Idle mode, does not go into Standby
mode and does not load the heads onto the media until receiving a new command. If a device receives
this command while the heads are currently on ramp, no physical action is needed. Power consumption of
the device is higher than normal low power idle mode moved by Power Management Feature.
