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Altera_Forum's avatar
Altera_Forum
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15 years ago

CVO and PAL - How?

Hi all, I am trying to generate a PAL video output using the VIP suite. At the moment my device (A cyclone 2c35) only has the test pattern generator and the clocked video output. I...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
15 years ago

Are you trying to do a true composite PAL signal? For that you need more than a simple video DAC. Or are you just trying to do an RGB or YPbPr component output at 576i?

In either case, your timings seem a bit off. For a 576i signal with a pixel clock of 13.5 MHz, the usual total frame size is usually 864x625 (864 * 625 * 25 = 13.5M).

One thing to check is if your DAC supports a pixel clock as low as 13.5 MHz. I have seen video encoders which require at least 27 MHz.