4.3.2Set Features command

This command controls the implementation of various features that the drive supports. When the drive receives this command, it sets BSY, checks the contents of the Features register, clears BSY and generates an interrupt. If the value in the register does not represent a feature that the drive supports, the command is aborted. Power-on default has the read look-ahead and write caching features enabled. The acceptable values for the Features register are defined as follows:

Table 12 Set Features command values

02H

Enable write cache (default).

03H

Set transfer mode (based on value in Sector Count register).

 

Sector Count register values:

 

00H

Set PIO mode to default (PIO mode 2).

 

01H

Set PIO mode to default and disable IORDY (PIO mode 2).

 

08H

PIO mode 0

 

09H

PIO mode 1

 

0AH

PIO mode 2

 

0BH

PIO mode 3

 

0CH

PIO mode 4 (default)

 

20H

Multiword DMA mode 0

 

21H

Multiword DMA mode 1

 

22H

Multiword DMA mode 2

 

40H

Ultra DMA mode 0

 

41H

Ultra DMA mode 1

 

42H

Ultra DMA mode 2

 

43H

Ultra DMA mode 3

 

44H

Ultra DMA mode 4

 

45H

Ultra DMA mode 5

 

46H

Ultra DMA mode 6

10H

Enable use of SATA features

 

02H

DMA Setup FIS Auto-Activate optimization

 

03H

Device-initiated interface power state transitions

 

06H

Software Settings Preservation

55H

Disable read look-ahead (read cache) feature

66H

Disable reverting to power-on defaults

82H

Disable write cache

90H

Disable use of SATA features

 

02H

DMA Setup FIS Auto-Activate optimization

 

03H

Device-initiated interface power state transitions

 

06H

Software Settings Preservation

AAH

Enable read look-ahead (read cache) feature (default).

CCH

Enable reverting to power-on defaults

Note. At power-on, or after a hardware or software reset, the default values of the features are as indicated above.

SEAGATE 600 PRO SSD PRODUCT MANUAL, REV. A

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Seagate ST120FP0001, ST100FP0021, ST100FP0001, ST120FP0021, ST200FP0001, ST200FP0021 manual Set Features command values

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