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5.3 Host Commands
C141-E203-01EN 5-101
*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 Sector Count field
Non-zero buffer offset in DMA Setup FIS 01h (*1)
DMA Setup FIS Auto-Activate optimization 02h (*2)
Device-initiated interface power state Transitions 03h (*3)
Guaranteed In-Order Data Deliverry 04h (*1)
Asynchronous Notification 05h (*1)
*1 The device normally responds to the command but performs no operation.
*2 This feature is prohibited 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 specification is prohibited when power on. While this function is
enabled, the device perform interface power save.
*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)
Acoustic mode (Slow Seek)
Abort
Non Operate
C0h-FEh
80h-BFh
01h-7Fh
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.