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SV35 Series SATA Product Manual, Rev. B
41
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
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.
Register 76543210
Features
Current Ignored R/W Reserved Ignored
Previous Default CCTL (7:0)
Sector Count
Current AU Size In Sectors (7:0)
Previous AU Size In Sectors (15:8)
LBA Low, Mid, High
Current Reserved
Previous Reserved
Device obs Ignored obs DEV Reserved
Command 51h
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.