IBM IC35L020 - Deskstar 20 GB Hard Drive - Read DMA Queued (C7 H); Figure 91. Read DMA Queued Command (C7 H); Figure 110. Output Parameters to the Device

15.13 Read DMA Queued (C7h)
see below
Status
1 1 0 0 0 1 1 1
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–V0V0V0V0V0VV
ERRIDXCORDRQDSCDFRDYBSYAMNT0NABT0IDN0UNCCRC
0123456701234567
Status RegisterError Register
Figure 91. Read DMA Queued Command (C7h)
This command executes in a similar manner to a READ 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 is begun, the device does not perform a bus release until the entire data transfer
has been completed.
Output parameters to the device
Feature
The 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
The starting sector number or LBA address bits 7–0.
Cylinder High/Low
The starting cylinder number or the LBA address bits 23–8.
H
The starting head number or the LBA address bits 27–24.
Deskstar 60 GXP Hard disk drive specification
126