
SpinPoint P80 Product Manual Rev. 01
71
6.4.27 Set Features (EFh)
This command is used by the host to establish the following parameters, which affect the execution of certain
drive features as shown in
Table 6-13
.
Table 6-13
Set Feature Register Definitions
Code
Description
02h Enable
Write
Cache
03h
Set transfer mode based on value in Sector Count register
33h Disable
Retry
42h
Enable Automatic Acoustic management feature set.
44h
Entire bytes of ECC apply on Read Long/Write Long commands
55h Disable
read
look-ahead
feature
66h
Disable reverting to power on defaults
77h Disable
ECC
82h
Disable Write Cache
88h Enable
ECC
99h Enable
Retries
AAh
Enable read look-ahead feature
BBh
4 bytes of ECC apply on Read Long/Write Long commands
C2h
Disable Automatic Acoustic management feature set.
CCh
Enable reverting to power on defaults
When the drive receives this command, it sets BSY, checks the contents of the Feature register, clears BSY,
and generates an interrupt. If the value in the Feature register is not supported or is invalid, the drive posts an
Aborted Command error. Refer to section 6.6.3 for the protocol.
A host can choose the transfer mechanism by Set Transfer Mode and specifying a value in the Sector Count
register. The upper 5 bits define the type of transfer, and the low order 3 bits encode the mode value. Refer to
Table 6-14
.
Table 6-14
Transfer mode values
MODE
Bits(7:3)
Bits(2:0)
PIO default mode
00000
000
PIO default mode, disable IORDY
00000
001
PIO flow control transfer mode
00001
mode
Multiword DMA mode
00100
mode
Ultra DMA mode
01000
mode
mode = transfer mode number
Содержание SP0401N
Страница 1: ...P80 Series Product Manual SAMSUNG 3 5 Hard Disk Drives April 21 2003 Rev 01 ...
Страница 2: ......
Страница 22: ...INSTALLATION SpinPoint P80 Product Manual Rev 01 14 Figure 4 2 Mounting Dimensions in Millimeters ...
Страница 33: ...SpinPoint P80 Product Manual Rev 01 25 Figure 5 1 Exploded Mechanical View ...
Страница 41: ...SpinPoint P80 Product Manual Rev 01 33 Figure 5 3 Read Write 88C5520 ...