ATAPI Interface | Chapter 5 |
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 |
CCh | Enable reverting to |
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 | |
21h | |
22h |
STT8000A Product Manual | Page 35 |
