IBM IC35L020 - Deskstar 20 GB Hard Drive - Write DMA Queued (Cch); Figure 137. Write DMA Queued Command (Cch)

15.37 Write DMA Queued (CCh)
see below
Status
1 1 0 0 1 1 0 0
Command
- - - - H H H H
Device/Head
1 L 1 D H H H H
Device/Head
V V V V V V V V
Cylinder High
V V V V V V V V
Cylinder High
V V V V V V V V
Cylinder Low
V V V V V V V V
Cylinder Low
V V V V V V V V
Sector Number
V V V V V V V V
Sector Number
V V V V V V V V
Sector Count
V V V V V V V V
Sector Count
see below
Error
V V V V V V V V
Feature
- - - - - - - -
Data
- - - - - - - -
Data
7 6 5 4 3 2 1 0
Register
7 6 5 4 3 2 1 0
Register
Command Block Input
Registers
Command Block Output
Registers
V–0–V0V0V0V0V00V
ERRIDXCORDRQDSCDFRDYBSYAMNT0NABT0IDN0UNCCRC
0123456701234567
Status RegisterError Register
Figure 137. Write DMA Queued Command (CCh)
This command executes in a similar manner to a WRITE DMA 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 has begun, the device does not perform a bus release until the entire data transfer
has been completed.
Output parameters to the device
Feature
This parameter is the number of sectors to be transferred. A value of
00h indicates that 256 sectors are to be transferred.
Sector Count
The Sector Count bits 7–3 (Tag) contain the Tag for the command being
delivered.
Sector Number
This is either the starting sector number or the LBA address bits 7–0.
Cylinder High/Low
This is either starting cylinder number or the LBA address bits 23–8.
H
This is either starting head number or the LBA address bits 27–24.
Deskstar 60 GXP Hard disk drive specification
181