Seagate ST1.3 ST1.3 Series Product Manual - Page 37

Set Features command, Table 10, Features register values

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4.1.3 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: Table 10: Features register values Feature 02H 03H 05H 55H 66H 82H 85H AAH CCH Description Enable Write Cache. Used for Set transfer mode Command. 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 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 Enable advanced power management Disable read look-ahead (read cache) feature. Disable Power On Reset (POR) establishment of defaults at Soft Reset. Disable write cache. Disable Advanced Power Management Enable read look-ahead (read cache) feature. Enable Power On Reset (POR) establishment of defaults at soft reset ST1.3 Series Product Manual, Rev. D 31

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ST1.3 Series Product Manual, Rev. D
31
4.1.3
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 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 10:
Features register values
Feature
Description
02
H
Enable Write Cache
.
03
H
Used for Set transfer mode Command.
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
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
05
H
Enable advanced power management
55
H
Disable read look-ahead (read cache) feature.
66
H
Disable Power On Reset (POR) establishment of defaults at Soft Reset.
82
H
Disable write cache.
85
H
Disable Advanced Power Management
AA
H
Enable read look-ahead (read cache) feature.
CC
H
Enable Power On Reset (POR) establishment of defaults at soft reset