Manual

Video formats, modes and bandwidth
GUPPY Technical Manual V7.1.0
204
The tables are divided into three formats:
They enable you to calculate the required bandwidth and to ascertain the
number of cameras that can be operated independently on a bus and in which
mode.
The frame rates in video modes 0 to 2 are specified, and settings are fixed
by IIDC V1.3.
Frame rates Format_7
In video Format_7 frame rates are no longer fixed.
Frame rates may be further limited by bandwidth limitation from the IEEE
1394 bus.
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: the curves
describe RAW8
• Table with max. frame rates as function of AOI by constant width
Format Resolution Max. video format
Format_0 up to VGA 640 x 480
Format_1 up to XGA 1024 x 768
Format_2 up to UXGA 1600 x 1200
Table 81: Overview fixed formats
Note

• If the cameras are operated with an external trigger the
maximum trigger frequency may not exceed the highest
continuous frame rate, thus preventing frames from
being dropped or corrupted.
• IEEE 1394 adapter cards with PCILynx™ chipsets have a
limit of 4000 bytes per cycle.
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.