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Momentus 5400 FDE.4 SATA Product Manual, Rev. C 37

4.2.6 Set 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:

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

cated above.

Table 10: Set Features command values

Enable write cache (default).

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

Sector Count register values:

Set PIO mode to default (PIO mode 2).

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

PIO mode 0

PIO mode 1

PIO mode 2

PIO mode 3

PIO mode 4 (default)

Multiword DMA mode 0

Multiword DMA mode 1

Multiword DMA mode 2

Ultra DMA mode 0

Ultra DMA mode 1

Ultra DMA mode 2

Ultra DMA mode 3

Ultra DMA mode 4

Ultra DMA mode 5

Ultra DMA mode 6

Disable read look-ahead (read cache) feature.

Disable write cache

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

Report full capacity available

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Acer Power 5400 Handbuch Seite 43