Data Translation 18729, User Manual

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Principles of Operation
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An interrupt is generated when an even or odd field has been
acquired; the PCI bus assigns the interrupt to the board automatically
when it is installed.
The speed of the PCI bus allows the DT3120 to transfer an unlimited
number of consecutive frames across the bus in real time. You can
acquire consecutive images, up to the capacity of available system
RAM.
Acting as a PCI bus master, the board sends pixel data over the PCI
bus directly using burst transfer rates up to 30 frames/s for 60 Hz
image formats and 25 frames/s for 50 Hz image formats, when used
with a 16-bit or 32-bit color display adapter board that supports DDI.