Seagate ST3250824SV ユーザーズマニュアル
SV35 Series SATA Product Manual, Rev. C
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.
commands, and informs the drive of the Allocation Unit size and alignment.
Protocol: non-data
FEATURES REGISTER FIELD DESCRIPTIONS
R/W
0
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):
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.
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).
The size of an Allocation Unit in sectors (bits 7:0).
Previous
The size of an Allocation Unit in sectors (bits 15:8)
The size of an Allocation Unit in sectors (bits 15:8)
DEVICE REGISTER FIELD DESCRIPTIONS
Dev
The selected device.
The selected device.
Register
7
6
5
4
3
2
1
0
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.