Seagate ST480HM000 Seagate 600 SSD Product Manual - Page 34

Set Features command, Note.

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

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S
EAGATE
600 SSD P
RODUCT
M
ANUAL
, R
EV
. 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