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5.3 Host Commands
C141-E239 5-119
Table 5.35 Features field values and settable modes (2/2)
Features
Field
Drive operation mode
X ' 85 ' Set the advanced power management mode to Mode-0.
X ' 86 ' Disables the Power-Up In Standby function. (Note)
X ' 88 ' Undefined (Note)
X ' 8B ' Disable Write Read Verify (T13 Proposal)
X ' 90’ Disables the Serial ATA function.
X ' AA ' Enables the read cache function.
X ' BB '
Specifies the transfer of 4-byte ECC for READ LONG and WRITE LONG
commands. (Note)
X ' C2 ' Disables the Acoustic management function.
X ' CC ' Enables the reverting to power-on default settings after software reset. (Note)
X ' DF '
Disable DRQ bit shall be zero when ERR bit is one. (T13 Proposal)
There is a dummy transferring when the error occurs by Read system command
of PIO.
Note: It does not actually function only by displaying Identify Device.
Note: Although there is a response to the command, nothing is done.
At power-on, the default mode is set as follows:
Write cashe function : Enabled
Transfer mode : PIO Mode-4, Multiworld DMA Mode-2
Advanced power
management function : Enabled (Mode-1)
Acoustic
management function : State keeping
Read cashe function : Enabled
At power-on or COMRESET, the default mode of Serial ATA function is set as
follows:
DMA Setup FIS Auto-Activate optimization : Disabled
Device-initiated interface power state Transitions : Disabled
Software Settings Preservation : Enabled