Seagate STT8000A Manual download pdf (Page 43)

ATAPI Interface Chapter 5

STT8000A Product Manual Page 35

Set Features (EFh)

If an unsupported feature is selected, the command is aborted. Otherwise, the

indicated parameter is set. The following list indicates the supported features:

Feature Number Set Feature Commands

03h Set Transfer Mode from Sector Count register

66h Disable reverting to power-on defaults (no-op)

CCh Enable reverting to power-on defaults (no-op)

Set Transfer Mode Feature

If the Set Transfer Mode feature (03h) is received, the Sector Count (ATAPI

Interrupt Reason) register is used to set the transfer mode based on the following

table. Any transfer modes not listed in the table cause the command to be aborted.

Sector Transfer Mode

00h PIO Transfer Mode 4 (default)

01h PIO Transfer Mode 2 (explicit IORDY disable)

08h PIO Transfer Mode 0

09h PIO Transfer Mode 1

0Ah PIO Transfer Mode 2

0Bh PIO Transfer Mode 3

0Ch PIO Transfer Mode4

10h Single Word DMA Mode 0

11h Single Word DMA Mode 1

12h Single Word DMA Mode 2

20h Multi-word DMA Mode 0

21h Multi-word DMA Mode 1

22h Multi-word DMA Mode 2

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Seagate STT8000A Manual Page 43