Write Dma Queued (Cch) - IBM DTTA-351010 - Deskstar 10.1 GB Hard Drive Specifications

12.36 Write DMA Queued (CCh)

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
V 0 0
Figure 124. Write D M A Queued Command (CCh)
This command executes in a similar manner to a WRITE D M A command. The device may perform a bus
release or it may execute the data transfer without performing a bus release if the data is ready to transfer.
If the device performs a bus release, the host shall reselect the device using the SERVICE command.
Once the data transfer is begun, the device does not perform a bus release until the entire data transfer has
been completed.
Output Parameters To The Device
Feature number of sectors to be transferred. A value of 00h indicates that 256 sectors are to
be transferred.
Sector Count bits 7 - 3 (Tag) contain the Tag for the command being delivered.
Sector Number starting sector number or LBA address bits 7 - 0.
Cylinder High/Low starting cylinder number or LBA address bits 23 - 8.
H starting head number or LBA address bits 27 - 24.
7 6 5 4 3 2 1 0
V V V V V V V V
V V V V V V V V
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
1 1 0 0 1 1 0 0
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 V V V V V V V V
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 S R V D R Q C O R I D X E R R
0 V 0 V
Command Descriptions
H H H H
2 1 0
0 V
163