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11.32 Read Stream Ext (2Bh)
Com m and 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
CRC
UNC
0
IDN
V
V
0
Table 190 Read Stream Ext Command (2Bh)
The Read Stream DMA Ext command reads one to 65536 sectors as specified in the Sector Count register. A
value of 0000h in the Sector Count register requests 65536 sectors.
The RC bit indicates that the drive operate in a continuous read mode for the Read Stream command. When RC is
cleared to zero the drive shall operate in normal Streaming read mode.
When the Read Continuous mode is enabled, the device shall transfer data of the requested length without setting
the ERR bit. The SE bit shall be set to one if the data transferred includes errors. The data may be erroneous in this
case.
If the Read Continuous bit is set to one, the device shall not stop execution of the command due to errors. If the RC
bit is set to one and errors occur in reading or transfer 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,UNC,IDNF, or ABRT, reported in the error log. If the RC 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
-
-
-
-
-
-
-
-
-
-
-
-
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
0
1
0
4
3
2
1
0
ABT
T0N
V
0
V
0
Western Digital Hard Disk Drive OEM Specification
Com m and Block Input Registers
1
0
Register
-
-
Data Low
-
-
Data High
V
V
Error
V
V
V
V
Sector Count
V
V
V
V
Sector Number
V
V
V
V
Cylinder Low
V
V
V
V
Cylinder High
V
V
-
-
Device/Head
1
1
Status
0
7
6
CCTO
BSY
RDY
V
0
V
216
7
6
5
4
-
-
-
-
-
-
-
-
...See Below ...
HOB=0
-
-
-
-
HOB=1
-
-
-
-
HOB=0
V
V
V
V
HOB=1
V
V
V
V
HOB=0
V
V
V
V
HOB=1
V
V
V
V
HOB=0
V
V
V
V
HOB=1
V
V
V
V
-
-
-
-
...See Below ...
Status Register
5
4
3
2
SE
DWE
DRQ
COR
V
0
-
0
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
-
-
-
-
1
0
IDX
ERR
-
V
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