4.1.8Set 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 inter- rupt. 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:

Features register 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

 

Abort, note supported

 

 

 

 

 

21H

 

Abort, note supported

 

 

 

 

 

22H

 

Abort, note supported

 

 

 

 

 

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

 

 

 

05H

Enable advanced power management

 

 

55H

Disable read look-ahead (read cache) feature.

 

 

82H

Disable write cache.

 

 

AAH

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

 

 

F1H

Report full capacity available

 

 

 

 

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

38

Momentus 5400 FDE Product Manual, Rev. C

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Seagate ST940811A, ST960814A, ST9100826A, ST980821A, ST9120826A manual Set Features command, Features register values
Page 43 Page 45

ST940811A, ST960814A, ST9120826A, ST980821A, ST9100826A specifications

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