11.48 Write DMA Queued (CAh/CBh)
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
ERRIDXCORDRQSRVDFRDYBSYAMNT0NABT0IDN0UNCCRC
0123456701234567
Status RegisterError Register
Figure 175. 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 be
transferred.
If the device performs a bus release, the host shall reselect the device using the SERVICE command.
When the data transfer has begun, the device does not perform a bus release until the entire data trans-
fer 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.
Deskstar 180GXP hard disk drive specifications
213
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