Set Features (Efh) - IBM DBCA-204860 - Travelstar 4.8 GB Hard Drive Specifications

12.26 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 95. Set Features Command (EFh)
The Set Feature command establishes the following parameters which affect the execution of certain features
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 (Warning.1)
03H Set transfer mode based on value in sector count register
05H Enable Advanced Power Management
09H Enable Address Offset mode
44H 34 bytes of ECC apply on Read Long/Write Long commands
55H Disable read look-ahead feature
66H Disable reverting to power on defaults
82H Disable write cache
85H Disable Advanced Power Management
89H Disable Address Offset mode
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
141