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 文章标题 : advanced power management level
帖子发表于 : 2008-01-28 12:36 
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The Advanced Power Management feature consists of:
• A Set Features subcommand code to enable Advanced Power Management
• A Set Features subcommand code to disable Advanced Power Management
• Identify Data bits to indicate that the feature is supported and enabled
• An Identify Data byte to indicate the current power management level.
Set Features Subcommand Code 05h, Enable Advanced Power Management
Subcommand code 05h allows the host to enable Advanced Power Management. To enable Advanced
Power management the host systems writes the sector count register with the desired Advanced power
management level and then executes a Set Features command with subcode 05h. The power management
level is a scale from the lowest power consumption setting of 01h to the maximum performance level of FEh,
see table 1.
代码:
Table 1− Advanced Power Management Levels
Mode                                Sector   Count
                                    Register
Maximum Performance
                                    FEh
Intermediate Power Management Levels
Without Standby
                                    81h - FDh
Minimum Power Consumption Without
Standby
                                    80h
Intermediate Power Management Levels With
Standby
                                    02h - 7Fh
Minimum Power Consumption With Standby
                                    01h
Reserved
                                    FFh
Reserved
                                    00h

Device performance increases with increasing power management levels. Device power consumption
increases with increasing power management levels. The power management levels may contain discrete
bands. For example, a device may implement one power management method from level 80h to A0h and a
higher performance, higher power consumption method from level A1h to FEh. Advanced Power
Management Levels 80h and higher do not permit the device to spin down to save power.
Set Features Subcommand Code 85h, Disable Advanced Power Management
Set Feature Subcommand 85H disables Advanced Power Management. Subcommand 85h may not be
implemented on all devices which implement Set Feature subcommand 05h.
Identify Data Support for Advanced Power Management
Identify Device Word 83 bit 3 indicates that Advanced Power Management is supported
Identify Device Word 86 bit 3 indicates that Advanced Power Management is Enabled
Identify Device Word 91 bits (0:7) contain the current Advanced Power Management level setting
Other Advanced Power Management Considerations
Advanced Power Management is independent of the standby timer setting. If both Advanced Power
Management and the standby timer are set the device will go to the standby state when the timer times out or
the device’s Advanced Power Management algorithm indicates that it is time to enter standby.


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帖子发表于 : 2008-01-28 12:43 
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http://t13.org/Documents/UploadedDocume ... 7126r2.pdf

sata hard disk
代码:
sudo hdparm -I /dev/sda |grep Advanced


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The Advanced Power Management feature consists of:
高级电源管理的功能包括:
• A Set Features subcommand code to enable Advanced Power Management
• 一组功能子命令代码来启动高级电源管理
• A Set Features subcommand code to disable Advanced Power Management
• 一组功能子命令代码来取消高级电源管理
• Identify Data bits to indicate that the feature is supported and enabled
• 识别数据位来确认该功能是否支持和启动
• An Identify Data byte to indicate the current power management level.
• 识别数据字节来确认当前的电源管理级别
Set Features Subcommand Code 05h, Enable Advanced Power Management
设置功能子命令代码05h,来启动高级电源管理
Subcommand code 05h allows the host to enable Advanced Power Management. To enable Advanced
子命令代码05h允许主机启用高级电源管理。启用高级电源管理,
Power management the host systems writes the sector count register with the desired Advanced power
主机系统写入相应的高级电源管理级别到扇区计数寄存器
management level and then executes a Set Features command with subcode 05h. The power management
并且执行一组功能命令代码05h。电源管理
level is a scale from the lowest power consumption setting of 01h to the maximum performance level of FEh,
级别是一个从最低电源消耗量01h到最大性能级别FEh的数值范围。
see table 1.
参阅表1
代码:
Table 1− Advanced Power Management Levels
表1--高级电源管理级别
Mode Sector Count
Register
模式 扇区计数寄存器值
Maximum Performance
FEh
最佳性能
Intermediate Power Management Levels
Without Standby
无待机的中等电源管理级别
81h - FDh
Minimum Power Consumption Without
Standby
无待机最小电源消耗
80h
Intermediate Power Management Levels With
Standby
可待机中等电源管理级别
02h - 7Fh
Minimum Power Consumption With Standby
可待机最小电源消耗
01h
Reserved
保留
FFh
Reserved
保留
00h

Device performance increases with increasing power management levels. Device power consumption
设备的性能提高也会提高电源管理的级别。设备电源消耗量
increases with increasing power management levels. The power management levels may contain discrete
增长是随着电源管理级别的提高。电源管理的级别包含非连续的
bands. For example, a device may implement one power management method from level 80h to A0h and a
范围。比如,一个设备可能实施了电源管理方式,其级别是从80h到A0h和
higher performance, higher power consumption method from level A1h to FEh. Advanced Power
在高性能状态,高电源消耗方式是从级别A1h到FEh。高级电源
Management Levels 80h and higher do not permit the device to spin down to save power.
管理级别80h或更高不允许该设备调低来节电。
Set Features Subcommand Code 85h, Disable Advanced Power Management
设置功能子命令代码85h,来取消高级电源管理
Set Feature Subcommand 85H disables Advanced Power Management. Subcommand 85h may not be
设置功能子命令85h来取消高级电源管理。子命令85h可能不会
implemented on all devices which implement Set Feature subcommand 05h.
对所有设备有效,特别是那些被设置功能子命令为05h的设备
Identify Data Support for Advanced Power Management
识别数据对高级电源管理的支持
Identify Device Word 83 bit 3 indicates that Advanced Power Management is supported
识别设备第83字的第3位是表示高级电源管理是否被支持
Identify Device Word 86 bit 3 indicates that Advanced Power Management is Enabled
识别设备第86字的第3位是表示高级电源管理是否被启用
Identify Device Word 91 bits (0:7) contain the current Advanced Power Management level setting
识别设备第91字的位0到7包含了当前高级电源管理的级别设定
Other Advanced Power Management Considerations
其它高级电源管理考量
Advanced Power Management is independent of the standby timer setting. If both Advanced Power
高级电源管理是独立于待机计时器设定的。如果当计时器的时间到了或者高级电源管理算法也表明某设备逝世后进入待机状态了,而且高级电源
Management and the standby timer are set the device will go to the standby state when the timer times out or
管理和待机计时器都设置了,该设备将进入待机状态
the device’s Advanced Power Management algorithm indicates that it is time to enter standby.


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