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11.59 Write Buffer DMA (EBh)
Com m and Block Output Registers
Register
7
6
Data
-
-
Feature
-
-
Sector Count
-
-
Sector Number
-
-
Cylinder Low
-
-
Cylinder High
-
-
Device/Head
1
-
Command
1
1
Error Register
7
6
5
4
CRC UNC
0
IDN
0
0
0
0
Table 250 Write Buffer DMA Command (EBh)
The Write Buffer DMA command transfers a sector of data from the host to the sector buffer of the device. The
sectors of data are transferred through the Data Register 16 bits at a time.
The Read Buffer and Write Buffer commands are synchronized such that sequential Write Buffer and Read Buffer
commands access the same 512 byte within the buffer.
5
4
3
2
1
0
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
1
D
-
-
-
-
1
0
1
0
1
1
3
2
1
0
0
ABT
T0N AMN
0
V
0
0
Western Digital Hard Disk Drive OEM Specification
Com m and Block Input Registers
Register
7
6
Data
-
-
Error
Sector Count
-
-
Sector Number
-
-
Cylinder Low
-
-
Cylinder High
-
-
Device/Head
-
-
Status
Status Register
7
6
5
4
BSY
RDY
DF
DSC
0
V
0
-
285
5
4
3
2
1
0
-
-
-
-
-
-
...See Below ...
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
...See Below ...
3
2
1
0
DRQ
COR
IDX
ERR
-
0
-
V
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