Read Long (22H/23H) - IBM DTTA-351010 - Deskstar 10.1 GB Hard Drive Specifications

12.13 Read Long (22h/23h)

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 91. Read Long Command (22h/23h)
The Read Long command read the designated one sector of data and the ECC bytes from disk media, then
transfers the data and ECC bytes from the device to the host.
After 512 bytes of data have been transferred, the device will keep setting D R Q = 1 to indicate that the device
is ready to transfer the ECC bytes to the host. The data is transferred 16 bits at a time, and the ECC bytes
are transferred 8 bits at a time. The number of ECC bytes are 4 or 34 according to setting of Set Feature
option. The default setting is 4 bytes of ECC data.
The command makes a single attempt to read the data and does not check the data using ECC, whatever is
read is returned to the host.
Output Parameters To The Device
Sector Count The number of continuous sectors to be transferred. The Sector Count must be set
to one.
Sector Number The sector number of the sector to be transferred. ( L = 0 )
In LBA mode, this register contains LBA bits 0 - 7. ( L = 1 )
Cylinder High/Low The cylinder number of the sector to be transferred. ( L = 0 )
In LBA mode, this register contains LBA bits 8 - 15 (Low), 16 - 23 (High). ( L = 1 )
120
O E M Specifications for DTTA-3xxxxx
7 6 5 4 3 2 1 0
0 0 0 0 0 0 0 1
V V V V V V V V
V V V V V V V V
V V V V V V V V
1 L 1 D H H H H
0 0 1 0 0 0 1 R
4 3 2 1 0
0 A B T T 0 N A M N
V 0 V 0 V
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 V V V V V V V V
C y l i n d e r L o w V V V V V V V V
C y l i n d e r H i g h V V V V V V V V
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 V
V
H H H H
2 1 0
0 V