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Write Stream DMA Ext (3Ah)
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
-
-
-
-
-
-
-
-
Current
V
V
V
V
-
V
V
V
Feature
Error
...See Below...
Previous
V
V
V
V
V
V
V
V
HOB=0
-
-
-
-
-
-
-
-
Current
V
V
V
V
V
V
V
V
Sector Count
Sector Count
Previous
V
V
V
V
V
V
V
V
HOB=1
-
-
-
-
-
-
-
-
HOB=0
V
V
V
V
V
V
V
V
Current
V
V
V
V
V
V
V
V
Sector Number
Sector Number
Previous
V
V
V
V
V
V
V
V
HOB=1
V
V
V
V
V
V
V
V
HOB=0
V
V
V
V
V
V
V
V
Current
V
V
V
V
V
V
V
V
Cylinder Low
Cylinder Low
Previous
V
V
V
V
V
V
V
V
HOB=1
V
V
V
V
V
V
V
V
HOB=0
V
V
V
V
V
V
V
V
Current
V
V
V
V
V
V
V
V
Cylinder High
Cylinder High
Previous
V
V
V
V
V
V
V
V
HOB=1
V
V
V
V
V
V
V
V
Device/Head
1
1
1
D
-
-
-
-
Device/Head
-
-
-
-
-
-
-
-
Command
0
0
1
1
1
0
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
CCTO
BSY
RDY
SE
DWE DRQ COR
IDX
ERR
V
0
0
V
0
V
0
V
0
V
V
0
-
0
-
V
Table 265 Write Stream DMA Ext Command (3Ah)
The Write Stream DMA Ext 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.
319
Western Digital Ultrastar DC HC310 SATA Product Manual