U Series CE Family Product Manual, Rev. A 29
3.1.3 Set Features command
This command controls the implementation of various feature s th at th e
drive supports. When the drive receives this command, it sets BSY,
checks the contents of the Features register, clears BSY a nd 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 ac ceptable
values for the Features register are defined as follows:
3 Ultra DMA mode 3 is supported.
4 Ultra DMA mode 4 is supported.
5 Ultra DMA mode 5 is supported.
8 Ultra DMA mode 0 is currently active.
9 Ultra DMA mode 1 is currently active.
10 Ultra DMA mode 2 is currently active.
11 Ultra DMA mode 3 is currently active.
12 Ultra DMA mode 4 is currently active.
13 Ultra DMA mode 5 is currently active.
Bit Word 93
13 1 = 80-conductor cable detected, CBLID above VIH
0 = 40-conductor cable detected, CBLID below VIL
Bit Word 94
0–7 Current AAM setting
8–15 AAM Power on default
02HEnable write cache

(default).

03HSet transfer mode (based on value in Sector Count register).
Sector Count register values:
00HSet PIO mode to default (PIO mode 2).
01HSet PIO mode to default and disable IORDY
(PIO mode 2).
08HPIO mode 0