Deskstar 7K250 Hard Disk Drive Specification
208
12.49 Write DMA Queued Ext (36h)
Table 134: Write DMA Queued Ext Command (36h)
This command executes in a similar manner to a WRITE DMA EXT command. The device may perform a bus
release or 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 re-select the device using the SERVICE command.
Once the data transfer is begun, the device shall not perform a bus release until the entire data transfer has been
completed.
Output parameters to the device
Feature Current
The number of continuous sectors to be transferred low order, bits (7:0)
Feature Previous
The number of continuous sectors to be transferred low order, bits (15:8). A value
of 0000h in the Feature register indicates that 65,536 sectors are to be transferred.
Sector Count Current
Bits 7 - 3 (Tag) contain the Tag for the command being delivered.
Sector Number Current
LBA (7:0)
Sector Number Previous
LBA (31:24)
Cylinder Low Current
LBA (15:8)
Cylinder Low Previous
LBA (39:32)
Cylinder High Current
LBA (23:16)
Cylinder High Previous
LBA (47:40)
Command Block Output Registers
Command Block Input Registers
Register
7 6 5 4 3 2 1 0
Register
7 6 5 4 3 2 1 0
Data Low
- - - - - - - -
Data Low
- - - - - - - -
Data High
- - - - - - - -
Data High
- - - - - - - -
Feature
Current
V V V V V V V V
Error see
below
Previous
V V V V V V V V
Sector
Count
Current
V V V V - - - -
Sector
Count
HOB=0
V V V V V V V V
Previous
- - - - - - - -
HOB=1
- - - - - - - -
Sector
Number
Current
V V V V V V V V
Sector
Number
HOB=0
V V V V V V V V
Previous
V V V V V V V V
HOB=1
V V V V V V V V
Cylinder
Low
Current
V V V V V V V V
Cylinder
Low
HOB=0
V V V V V V V V
Previous
V V V V V V V V
HOB=1
V V V V V V V V
Cylinder
High
Current
V V V V V V V V
Cylinder
High
HOB=0
V V V V V V V V
Previous
V V V V V V V V
HOB=1
V V V V V V V V
Device/Head
- 1 - D - - - -
Device/Head
- - - - - - - -
Command
0 0 1 1 0 1 1 0
Status
See below ...
Error Register
Status Register
7
6
5
4
3
2
1
0
7
6
5
4
3
2
1
0
CRC
UNC
0
IDN
0
ABT
T0N
AMN
BSY RDY
DF
DSC
DRQ
COR IDX
ERR
V
0
0
V
0
V
0
0
0
V
0
V
-
0
-
V
Содержание Deskstar 7K250
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