Set Features (Efh) - IBM DTTA-351010 - Deskstar 10.1 GB Hard Drive Specifications

12.27 Set Features (EFh)

C o m m a n d B l o c k O u t p u t R e g i s t e r s
R e g i s t e r
D a t a
F e a t u r e
S e c t o r C o u n t
S e c t o r N u m b e r
C y l i n d e r L o w
C y l i n d e r H i g h
D e v i c e / H e a d
C o m m a n d
E r r o r R e g i s t e r
7 6 5
C R C U N C 0 I D N
0 0 0
Figure 109. Set Features Command (EFh)
The Set Feature command is to establish the following parameters which affect the execution of certain fea-
tures as shown in below table.
ABT will be set to 1 in the Error Register if the Feature register contains any undefined values.
Output Parameters To The Device
Feature Destination code for this command.
02H Enable write cache
03H Set transfer mode based on value in sector count register
44H 34 bytes of ECC apply on Read Long/Write Long commands
55H Disable read look-ahead feature
5DH Enable release interrupt
66H Disable reverting to power on defaults
82H Disable write cache
AAH Enable read look-ahead feature
BBH 4 bytes of ECC apply on Read Long/Write Long commands
CCH Enable reverting to power on defaults
7 6 5 4 3 2 1 0
V V V V V V V V
N o t e . 1
1 1 D
1 1 1 0 1 1 1 1
4 3 2 1 0
0 A B T T 0 N A M N
0 0 V 0 0
C o m m a n d B l o c k I n p u t R e g i s t e r s
R e g i s t e r 7 6 5 4 3 2 1 0
D a t a
E r r o r . . . S e e B e l o w . . .
S e c t o r C o u n t
S e c t o r N u m b e r
C y l i n d e r L o w
C y l i n d e r H i g h
D e v i c e / H e a d
S t a t u s . . . S e e B e l o w . . .
S t a t u s R e g i s t e r
7 6 5 4 3
B S Y R D Y D F D S C D R Q C O R I D X E R R
0 V 0
Command Descriptions
2 1 0
0 V
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