Write Dma (Cah/Cbh); Figure 173. Write Dma Command (Cah/Cbh) - Hitachi ic35l060avv207-0 - Deskstar 60 GB Hard Drive Specifications

3.5 inch ultra ata/100 hard disk drive
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11.46 Write DMA (CAh/CBh)

Command Block Output Registers
Register
Data
Feature
Sector Count
Sector Number
Cylinder Low
Cylinder High
Device/Head
Command
Error Register
7
6
5
CRC
UNC
0
V
0
0

Figure 173. Write DMA Command (CAh/CBh)

The Write DMA command transfers one or more sectors of data from the host to the device. The data is
then written to the disk media.
The sectors of data are transferred through the Data Register 16 bits at a time.
The host initializes a slave-DMA channel prior to issuing the command. Data transfers are qualified by
DMARQ and are performed by the slave-DMA channel. The device issues only one interrupt per com-
mand to indicate that the data transfer has terminated and the status is available.
If an uncorrectable error occurs, the write will be terminated at the failing sector.
Output parameters to the device
Sector Count
Sector Number
Cylinder High/Low
H
R
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
1 L 1 D H H H H
1 1 0 0 1 0 1 R
4
3
2
1
IDN
0
ABT
T0N
AMN
V
0
V
0
The number of continuous sectors to be transferred. If 0 is specified, 256 sectors
will be transferred.
The sector number of the first sector to be transferred. (L=0)
In LBA mode this register contains LBA bits 0 - 7. (L=1)
The cylinder number of the first sector to be transferred. (L=0)
In LBA mode this register contains LBA bits 8 - 15 (Low), 16 - 23 (High). (L=1)
The head number of the first sector to be transferred. (L=0)
In LBA mode this register contains LBA bits 24 - 27. (L=1)
The retry bit. This bit is ignored.
Deskstar 180GXP hard disk drive specifications
Command Block Input Registers
Register
Data
Error
Sector Count
Sector Number
Cylinder Low
Cylinder High
Device/Head
Status
Status Register
0
7
6
5
BSY
RDY
DF
0
0
V
0
209
7 6 5 4 3 2 1 0
- - - - - - - -
see below
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
- - - - H H H H
see below
4
3
2
1
0
DSC
DRQ
COR
IDX
ERR
V
-
0
-
V

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