Instruction manual

Marlin Technical ManualV.2.7.0
127
Video formats, modes and bandwidth
The frame rates in video modes 0 to 2 are specified and set fixed by IIDC V1.3.
Frame rates Format_7
In video Format_7 frame rates are no longer fixed but can be varied dynamically
by the parameters described below.
The following formula is used to calculate for the CCD models the highest frame
rate in Format_7:
It assumes that the maximum frame rate is the inverse of the sum of all events in
a CCD, which take time such as:
Details are described in the next chapters:
• Max. frame rate of CCD (theoretical formula)
• Diagram of frame rates as function of AOI by constant width
• Table with max. frame rates as function of AOI by constant width
Note

• Different values apply for the different sensors.
• Frame rates may be further limited by longer shutter
times and/or bandwidth limitation from the IEEE 1394
bus.
Formula 3: Frame rate calculation
Note

• The time to transfer the storage to the vertical shift reg-
ister (Charge transfer time)
• The time to shift out the dummy lines
• The time to dump the lines outside the AOI
• The time to shift out the lines of the AOI. (Scanning time)
Note

Different parameters apply for different models.
framerate
In
framerate
CCD
1
T
Ch eTransarg
T
Dummy
T
Dump
T
Scan
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