5.3 Host Commands

Single word DMA transfer mode X

00010 000 (X’10’: Mode 0)

 

00010

001

(X’11’: Mode 1)

 

00010

010

(X’12’: Mode 2)

Multiword DMA transfer mode X

00100 000 (X’20’: Mode 0)

 

00100

001 (X’21’: Mode 1)

 

00100

010 (X’22’: Mode 2)

Ultra DMA transfer mode X

01000 000 (X’40’: Mode 0)

 

01000 001 (X’41’: Mode 1)

 

01000 010 (X’42’: Mode 2)

The host writes the Sector Count register with the desired power management level and executes this command with the Features register X’05’, and then Advanced Power Management is enabled.

Level

Sector Count register

 

 

Power management without standby

80h-FEh

Power management with standby

01h-7Fh

Reserved

FFh, 00h

 

 

(15) SET MULTIPLE MODE (X’C6’)

This command enables the device to perform the READ MULTIPLE and WRITE MULTIPLE commands. The block count (number of sectors in a block) for these commands are also specified by the SET MULTIPLE MODE command.

The number of sectors per block is written into the Sector Count register. The IDD supprots 2, 4, 8, 16 and 32 (sectors) as the block counts.

Upon receipt of this command, the device sets the BSY bit of the Status register and checks the contents of the Sector Count register. If the contents of the Sector Count register is valid and is a supported block count, the value is stored for all subsequent READ MULTIPLE and WRITE MULTIPLE commands. Execution of these commands is then enabled. If the value of the Sector Count register is not a supported block count, an ABORTED COMMAND error is posted and the READ MULTIPLE and WRITE MULTIPLE commands are disabled.

If the contents of the Sector Count register is 0 when the SET MULTIPLE MODE command is issued, the READ MULTIPLE and WRITE MULTIPLE commands are disabled.

C141-E057-02EN

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Fujitsu MHF2043AT, MHE2043AT, MHF2021AT, MHE2064AT manual SET Multiple Mode X’C6’