33
Appendix
DFW-SX910/X710
5. Issues to be considered with partial activation
With partial activation, high-speed operation of the
CCD occurs.
If strong light comes into the image at the same time,
there may be some influence at the edges of the image.
In such a case then, adjust the lens so that only the
appropriate amount of light is allowed.
6. About the address range available for
BlockWrite operations
The camera performs BlockWrite operations against
consecutive registers. However, the range of the
addresses stored in these registers are limited.
Available address ranges for
Functions
BlockWrite operations
F0F00600h – F0F00614h
Frame rate/Video mode/Video
format/Isochronous channel/
Isochronous speed/
Isochronous_Enable
F0F00800h – F0F008fCh
Feature control
F0F30000h – F0F30008h
ACR
F0F50000h – F0F500FCh
User memory
If BlockWrite operations are performed outside the
ranges listed above, an address error will occur.
Meanwhile, the camera can perform BlockRead
operations for any sequence of consecutive registers
even though the registers are not available for
BlockWrite operations.
In Format7 CSR, for example, BlockWrite operations
are prohibited because Format7 CSR requires a
process for setting the register. However, BlockRead is
possible in Format7 CSR.
7. Note on the isochronous control register
The BlockWrite operations are available in the range
F0F00600h to F0F00614h. However, setting the video
mode in this range is not recommended because it may
influence the variable range available for the features.
Following the process listed below is recommended
for setting the isochronous control register.
Set the isochronous channel/isochronous speed
(F0F0060Ch)
Set the video format
(F0F00608h)
Set the video mode
(F0F00604h)
Set the frame rate
(F0F00600h)
Confirm the variable range for the various features
(F0F00500-F0F005FCh)
Set the features (as needed) (F0F00800-F0F008FCh)
Prepare for video data capture
Video start
(F0F00614h)
8. Converting Y/Cr/Cb to R/G/B
The camera outputs digital Y/Cr/Cb data. To convert
the digital Y/Cr/Cb data to R/G/B data, use following
formula.
R
≈
1.Y
B
≈
1.Y
G
≈
Y–0.7144Cr–0.3457Cb
9. Timing of the change in feature setting
The change in feature setting will take effect when the
next exposure starts. When you change the shutter
setting during a long exposure, you need to note that
the change in shutter setting does not cancel the
current exposure. The current exposure will complete
with the previous shutter setting.
If you intend to start the exposure with a new shutter
setting immediately, either stop the output, then
change the setting and start the output again, or change
the setting, then stop the output and start it again.
10. Timing of the video transmission command and
that of the output
In Continuous Shot and Multi Shot modes, the bus
synchronization system works automatically.
Therefore, the timing of the acceptance of a command
does not synchronize with that of the output.
On the other hand, in One Shot mode or long exposure
mode, the bus synchronization system does not work.
Therefore, the camera starts the exposure immediately
after the video transmission command is accepted, and
the video will be output when the exposure is
complete.
