ST1.2 Series Product Manual, Rev. B
35
4.1.4
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 inter-
rupt. 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:
Table 11:
Features register values
Feature Description
Availability in Interface Mode
CF Memory
or I/O
TrueIDE
or IDE
01
H
Enable 8-bit data transfer; Only in True IDE mode.
No
Yes
02
H
Enable Write Cache
.
Yes
Yes
03
H
Used for Set transfer mode Command.
Sector Count register values:
Yes
Yes
00
H
Set PIO mode to default (PIO mode 2).
Yes
Yes
01
H
Set PIO mode to default and disable IORDY (PIO mode 2).
Yes
Yes
08
H
PIO mode 0
Yes
Yes
09
H
PIO mode 1
Yes
Yes
0A
H
PIO mode 2
Yes
Yes
0B
H
PIO mode 3
Yes
Yes
0C
H
PIO mode 4
(default)
Yes
Yes
20
H
Multiword DMA mode 0
No
Yes
21
H
Multiword DMA mode 1
No
Yes
22
H
Multiword DMA mode 2
No
Yes
40
H
Ultra DMA mode 0
No
Yes
41
H
Ultra DMA mode 1
No
Yes
42
H
Ultra DMA mode 2
No
Yes
05
H
Enable advanced power management
Yes
Yes
0A
H
Enable Power Level 1 commands
Yes
Yes
44
H
Product Specific ECC bytes (XX bytes) apply on Read/Write Long Command
Yes
Yes
55
H
Disable read look-ahead (read cache) feature.
Yes
Yes
66
H
Disable Power On Reset (POR) establishment of defaults at Soft Reset.
Yes
Yes
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