5.3 Host Commands
*2)
Advanced Power Management (APM)
The host writes the Sector Count field with the desired power management level
and executes this command with the Features field X’05’, and then Advanced
Power Management is enabled.
The drive automatically shifts to power saving mode up to the specified APM level
when the drive does not receive any commands for a specific time. The sequence in
which the power management level shifts is from Active Idle to Low Power Idle to
Standby. The Mode-2 level requires the longest shifting time, depending on the APM
level settings. The settings of the APM level revert to their default values (Mode-1)
when power-on or COMRESET occurs for the drive
.
APM Level
Sector Count
Field
Mode 0 Active Idle
→
Low Power Idle
Mode 1 Active Idle
→
Low Power Idle
Mode 2 Active Idle
→
Low Power Idle
→
Standby
Reserve (State Keep)
C0h-FEh
80h-BFh
01h-7Fh
00h, FFh
Active Idle:
The spindle motor rotates, and the head is loaded on
the most inner position on media.
Low Power Idle: The spindle motor rotates, and the head is unloaded.
Standby:
The spindle motor stops, and the head is unloaded.
C141-E254
5-123
Summary of Contents for MHX2250BT
Page 1: ...C141 E254 01EN MHX2300BT MHX2250BT DISK DRIVES PRODUCT MANUAL ...
Page 4: ...This page is intentionally left blank ...
Page 8: ...This page is intentionally left blank ...
Page 10: ...This page is intentionally left blank ...
Page 12: ...This page is intentionally left blank ...
Page 42: ...This page is intentionally left blank ...
Page 54: ...This page is intentionally left blank ...
Page 59: ...4 3 Circuit Configuration PCA Figure 4 2 Circuit configuration C141 E254 4 5 ...
Page 74: ...This page is intentionally left blank ...
Page 86: ...Interface Figure 5 2 Example of the circuit for driving Activity LED 5 12 C141 E254 ...
Page 256: ...This page is intentionally left blank ...
Page 278: ...This page is intentionally left blank ...
Page 282: ...This page is intentionally left blank ...
Page 284: ...This page is intentionally left blank ...
Page 292: ...This page is intentionally left blank ...
Page 294: ......
Page 295: ......
Page 296: ......