Set Features Command - Seagate ST320014A Product Manual

28
4
5
8
9
10
11
12
13
Bit
13
Bit
0–7
8–15

3.1.3 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:
02 Enable write cache (default).
H
03 Set transfer mode (based on value in Sector Count register).
H
Sector Count register values:
00
H
01
H
08
H
09
H
Ultra DMA mode 4 is supported.
Ultra DMA mode 5 is supported.
Ultra DMA mode 0 is currently active.
Ultra DMA mode 1 is currently active.
Ultra DMA mode 2 is currently active.
Ultra DMA mode 3 is currently active.
Ultra DMA mode 4 is currently active.
Ultra DMA mode 5 is currently active.
Word 93
1 = 80-conductor cable detected, CBLID above V
0 = 40-conductor cable detected, CBLID below V
Word 94
Current AAM setting
AAM Power on default
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
ST320014A Product Manual, Rev. B
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