Fujitsu MHV2080BH, MHV2100BH, MHV2040BH Serial ATA Functions, Automatic Acoustic Management AAM

5.3 Host Commands

*3) Serial ATA Functions

The host can enable and disable the following Serial ATA functions by issuing this command after setting X'10/90' in the Features field and an applicable value in the Sector Count field:

Serial ATA function

Non-zero buffer offset in DMA Setup FIS

DMA Setup FIS Auto-Activate optimization

Device-initiated interface power state Transitions

Guaranteed In-Order Data Delivery

Asynchronous Notification

Software Settings Preservation

Sector Count field

01h (*1)

02h (*2)

03h (*3)

04h (*1)

05h (*1)

06h (*4)

*1 The device normally responds to the command but performs no operation.

*2 This feature is disabled when power is on. While this function is enabled, the device does not return the DMA Activate FIS for the first data sector after the WRITE FP DMA QUEUED command is issued.

*3 This feature is disabled when power is on. While this function is enabled, the device perform interface power save.

*4: This feature is enabled when power is on. While this function is enabled, the device preserves the software settings across COMRESET.

*4) Automatic Acoustic Management (AAM)

The host writes to the Sector Count filed with the requested acoustic management level and executes this command with subcommand code 42h, and then Automatic Acoustic Management is enabled. The AAM level setting is preserved by the drive across power on and COMRESET.

AAM Level	Sector Count Filed
Performance mode (Fast Seek)	C0h-FEh
Acoustic mode (Slow Seek)	80h-BFh
Abort	01h-7Fh
Non Operate	00h, FFh

High-speed seek to which gives priority to the performance operates as for "Performance mode", and low-speed seek by which the seek sound is suppressed operates as for "Acoustic mode".

Setting the seek mode by this command is applied to the seek operation in all command processing.

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