Table 177 Write Stream Dma Command (3Ah); Write Stream Dma (3Ah) - Hitachi HDS723020BLA642 Specifications
3.5 inch serial ata hard disk drive
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- Datasheet (2 pages) ,
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11.57 Write Stream DMA (3Ah)
Command Block Output Registers
Register
Data Low
Data High
Current
Feature
Previous
Current
Sector Count
Previous
Current
Sector
Number
Previous
Current
Cylinder Low
Previous
Current
Cylinder High
Previous
Device/Head
Command
Error Register
7
6
5
4
CRC
UNC
0
IDN
V
0
0
V
Table 177 Write Stream DMA Command (3Ah)
The Write Stream DMA command allows the host to write data using the DMA data transfer protocol. This
command allows for the host to specify to the device that additional actions need to be performed prior to the
completion of the command if the required bits are set.
If the Write Continuous bit is set to one, the device shall not stop execution of the command due to errors. If
the WC bit is set to one and errors occur in the transfer or writing of the data, the device shall continue to transfer
the amount of data requested and then provide ending status with the BSY bit cleared to zero, the SE bit set to
one, the ERR bit cleared to zero, and the type of error, ICRC, IDNF, or ABRT, reported in the error log. If the
WC bit is set to one and the Command Completion Time Limit expires, the device shall stop execution of the
command and provide ending status with BSY bit cleared to zero, the SE bit set to one, the ERR bit cleared to
zero, and report the fact that the Command Completion Time Limit expired by setting the CCTO bit in the error
log to one, In all cases, the device shall attempt to transfer the amount of data requested within the Command
Completion Time Limit event if some data transferred is in error.
7
6
5
4
3
2
1
-
-
-
-
-
-
-
-
-
-
-
-
-
-
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
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
V
V
V
V
V
1
1
1
D
-
-
-
0
0
1
1
1
0
1
3
2
1
0
ABT
T0N
CCTO
0
V
0
Hitachi hard disk drive specifications
Command Block Input Registers
0
Register
-
Data Low
-
Data High
V
Error
V
V
HOB=0
Sector Count
V
HOB=1
V
HOB=0
Sector
Number
V
HOB=1
V
HOB=0
Cylinder Low
V
HOB=1
V
HOB=0
Cylinder High
V
HOB=1
-
Device/Head
0
Status
0
7
6
5
BSY
RDY
SE
V
0
V
V
255
7
6
5
4
3
2
-
-
-
-
-
-
-
-
-
-
-
-
...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
V
V
V
V
-
-
-
-
-
-
...See Below...
Status Register
4
3
2
1
DWE DRQ
COR
IDX
0
-
0
-
1
0
-
-
-
-
-
-
-
-
V
V
V
V
V
V
V
V
V
V
V
V
-
-
0
ERR
V
- Quick Links:
- Table 1 Type and Model
- General Features
- Data Sheet
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