Hitachi C4K60 Specifications - Page 38

Advanced Power Management

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7.2.2.3. Advanced Power Management The host can select the power saving control pattern by Advanced Power management (APM). The device performs an intelligent power saving control based on the selected pattern by host. Using Set Feature command and Sector Count Register can set the APM operation mode. The Sector count value is related to the performance level and the power consumption level. If the Sector Counter value is set to 01h, the power consumption is getting better, but the performance is getting worse. If the large Sector Count Register is set to FEh, the performance is getting better sacrificing the power consumption. The device has five levels of APM operation mode (APM mode 0,1,2,3 and 4) depending on the Sector Counter values from 01h to FEh. Using the following command, the APM control can be set the mode and reset the mode. - Set Feature command, Enable Advanced Power Management sub-command. (Command Code = EFh, Features = 05h) - Set Feature command, Disable Advanced Power Management sub-command. (Command Code = EFh, Features = 85h) The Enable Advanced Power Management sub-command enables the APM operation set by the Sector Count Register. The Disable Advanced Power Management sub-command disables the APM operation. If the APM operation is disabled, the device performs APM mode 0. Table 7.2 Low Power Consumption Mode Transition Time Operation Mode APM Value *1 Operation APM Mode 0 C0h - FEh Move to Low Power Idle mode APM Mode 1 A0h - BFh Move to Low Power Idle mode APM Mode 2 80h - 9Fh Move to Low Power Idle mode (Power on Default) APM Mode 3 20h - 7Fh Move to Standby mode *2 APM Mode 4 01h - 1Fh *1: This value is set by Sector Count register of Enable Advanced power management sub-command. If non-defined values 00h and FFh are set, the device returns Aborted command. *2: APM function does not affect on the Standby timer value. The Standby timer and the Standby mode transition control of APM function is operated independently. K6610170 Rev.2 Dec 22, 2004 - 38 -

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K6610170
Rev.2
Dec 22, 2004
- 38 -
7.2.2.3. Advanced Power Management
The host can select the power saving control pattern by Advanced Power management (APM). The device
performs an intelligent power saving control based on the selected pattern by host.
Using Set Feature command and Sector Count Register can set the APM operation mode. The Sector count
value is related to the performance level and the power consumption level. If the Sector Counter value is set
to 01h, the power consumption is getting better, but the performance is getting worse. If the large Sector
Count Register is set to FEh, the performance is getting better sacrificing the power consumption. The
device has five levels of APM operation mode (APM mode 0,1,2,3 and 4) depending on the Sector Counter
values from 01h to FEh.
Using the following command, the APM control can be set the mode and reset the mode.
-
Set Feature command, Enable Advanced Power Management sub-command.
(Command Code = EFh, Features = 05h)
-
Set Feature command, Disable Advanced Power Management sub-command.
(Command Code = EFh, Features = 85h)
The Enable Advanced Power Management sub-command enables the APM operation set by the Sector
Count Register. The Disable Advanced Power Management sub-command disables the APM operation.
If the APM operation is disabled, the device performs APM mode 0.
Table 7.2 Low Power Consumption Mode Transition Time
Operation Mode
APM Value
*1
Operation
APM Mode 0
C0h - FEh
Move to Low Power Idle mode
APM Mode 1
A0h – BFh
Move to Low Power Idle mode
APM Mode 2
80h – 9Fh
Move to Low Power Idle mode (Power on Default)
APM Mode 3
20h – 7Fh
Move to Standby mode
*2
APM Mode 4
01h – 1Fh
*1
: This value is set by Sector Count register of Enable Advanced power management sub-command. If
non-defined values 00h and FFh are set, the device returns Aborted command.
*2
: APM function does not affect on the Standby timer value. The Standby timer and the Standby mode
transition control of APM function is operated independently.