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SEAGATE VIDEO 2.5 HDD PRODUCT MANUAL, REV. F 23

SERIAL ATA (SATA) INTERFACE

4.3.2 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 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:

BIT WORD 93

13 1 = 80-conductor cable detected, CBLID above VIH

0 = 40-conductor cable detected, CBLID below VIL

Table 12 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

NOTE

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

Table 11 Bit Descriptions (continued)

1 2 ... 22 23 24 25 26 27 28 29 30 31 32

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