360050398

10.8.35 Set Features

(EFh)

 

 

 

 

 

 

 

 

COMMAND CODE

 

1 1 1 0 1 1 1 1

REGISTER

 

 

REGISTER SETTING

NORMAL COMPLETION

 

DR

 

DRIVE No.

no change

 

CY

 

 

 

no change

 

HD

 

 

 

no change

 

SN

 

 

 

no change

 

SC

Mode Selection for Data Transfer(*2)

no change

 

FT

 

Features(*1)

no change

(*1) Features: FT register defines following selections.

02H

Enable write cache feature

03H

Select data transfer mode

05H

Enable advanced power management

55H

Disable read look-ahead feature

66H

Disable reverting to power on defaults by soft reset

82H

Disable write cache feature

85H

Disable advanced power management

AAH

Enable read look-ahead feature

CCH

Enable reverting to power on defaults by soft reset

others

Invalid (reporting with Aborted Command Error)

(*2)Mode selection for data transfer is specified in sector count register. Upper 5 bits show transfer mode and lower 3 bits show mode figure.

PIO default transfer mode

00000 000

PIO default transfer mode, disable IORDY

00000 001

PIO flow control transfer mode nnn

00001 nnn

Multiword DMA mode nnn

00100 nnn

Ultra DMA mode nnn

01000 nnn

Reserved

10000 nnn

PIO default mode is mode 4 flow control. DMA default mode is Multiword DMA mode 2.

The level of Advanced Power Management function is set in Sector count register.

C0h-FEh

……

Mode0 (Power save up to

Low Power Idle)

80h-BFh

……

Mode1

(Power save up to

Low Power Idle)

01h-7Fh

……

Mode2

(Power save up to

Standby)

00h,FFh

……

Aborted

 

Transition time of power save is changed dynamically in Mode1 and Mode2 due to Adaptive power control function. The function level is set to Mode1 when Advanced Power Management function is disabled.

If FT register has any other value, the drive rejects the command with Abort Command error.

Default settings after power on or hard reset are:

Data transfer mode of Multiword DMA mode 2, PIO mode 4 flow control,

4 bytes ECC, look-ahead read enabled, write cache enabled, advanced power management enabled, READ/WRITE Multiple command enabled (16 sectors)

and reverting to power on defaults by soft reset disabled.

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