DAC and PLL Programming
PCVisionplus
Hardware Reference
4–23
Rev 02; February 8, 2002
of pixels to 644. This will cause the pixel clock calculation to give a slightly smaller Pclk producing more pixels from
the fixed active time. Cropping can be adjusted to display only 640 pixels.
Variations in Pclk not only effect the pixel sample rate but also the PTG sync outputs which are driven to the camera.
Large changes to Pclk will require recalculating all PTG settings based on the new Pclk value.
When driving the camera with internal timing in XTAL mode, the camera video signal may delayed with respect to
the PTG output timing, used in sampling, clamping, and driving the PWG. The PWG horizontal and vertical settings
may have to be increased to compensate for this delay.
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