Seagate SV35 Series SATA Product Manual page 47

4.3.4.2.1 Configure Stream (51h)
The Configure Stream command specifies the default CCTL (Command Completion Time Limit) for streaming
commands, and informs the drive of the Allocation Unit size and alignment.
Protocol: non-data
Register
Features
Current
Previous
Sector Count
Current
Previous
LBA Low, Mid, High
Current
Previous
Device
Command
Note: The value indicated as Current is the value most recently written to the register. The value indicated as Previous is
the value that was in the register before the most recent write to the register.
FEATURES REGISTER FIELD DESCRIPTIONS
R/W
0 Read stream
1 Write stream
Default CCTL (Default Command Completion Time Limit)
This value is calculated as follows (with the unit of measure being microseconds):
Default CCTL = ((content of the Features register) * (IDENTIFY DEVICE words (99:98))
This time shall be used by the drive when an individual streaming command with a CCTL of 0 is issued. The
time is measured from the write of the command register to the final INTRQ for command completion.
SECTOR COUNT REGISTER FIELD DESCRIPTIONS
Current
The size of an Allocation Unit in sectors (bits 7:0).
Previous
The size of an Allocation Unit in sectors (bits 15:8)
DEVICE REGISTER FIELD DESCRIPTIONS
Dev
The selected device.
SV35 Series SATA Product Manual, Rev. C
7 6 5
Ignored R/W
obs Ignored obs
4 3
Reserved
Default CCTL (7:0)
AU Size In Sectors (7:0)
AU Size In Sectors (15:8)
Reserved
Reserved
DEV
51h
2 1 0
Ignored
Reserved
41