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SEAGATE 600 SSD PRODUCT MANUAL, REV. B 30
4.3.2 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 regis ter, 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:
Note. At power-on, or after a hardware or software reset, the default values of the features are as
indicated above.
Table 9 Set Features command values
02
H
Enable write cache (default).
03
H
Set transfer mode (based on value in Sector Count register).
Sector Count register values:
00
H
Set PIO mode to default (PIO mode 2).
01
H
Set PIO mode to default and disable IORDY (PIO mode 2).
08
H
PIO mode 0
09
H
PIO mode 1
0A
H
PIO mode 2
0B
H
PIO mode 3
0C
H
PIO mode 4 (default)
20
H
Multiword DMA mode 0
21
H
Multiword DMA mode 1
22
H
Multiword DMA mode 2
40
H
Ultra DMA mode 0
41
H
Ultra DMA mode 1
42
H
Ultra DMA mode 2
43
H
Ultra DMA mode 3
44
H
Ultra DMA mode 4
45
H
Ultra DMA mode 5
46
H
Ultra DMA mode 6
10
H
Enable use of SATA features
02
H
DMA Setup FIS Auto-Activate optimization
03
H
Device-initiated interface power state transitions
06
H
Software Settings Preservation
55
H
Disable read look-ahead (read cache) feature
66
H
Disable reverting to power-on defaults
82
H
Disable write cache
90
H
Disable use of SATA features
02
H
DMA Setup FIS Auto-Activate optimization
03
H
Device-initiated interface power state transitions
06
H
Software Settings Preservation
AA
H
Enable read look-ahead (read cache) feature (default).
CC
H
Enable reverting to power-on defaults