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I'm using the Clocked Video Output (CVO) core from the VIP (Video and Image Processing) suite
on Altera Cyclone III video development card with Bitec HSMC DVI input/output daughtercard to display a mixed video (non interlaced) on a DVI monitor. I want the CVO modes to display different output resolutions:1280x1024, 1024x768 and 800x600 The default mode configured in the QSYS hardware is for 1024x768 resolution. The way I configure the modes is: set mode invalid, write registers, stop CVO, set mode valid, start CVO. When I run this and ask for the "Video Mode Matched" register I get "0" with a 1024x768 input and it displays the image. But after changing the input I get the different modes from "Video Mode Matched" but I don't get any image and the display enters into sleep mode. So, my questions are... Where can I find all those video parameters, in case i'm not adding them correctly? Are there any examples which uses different output modes? Is there another possible error in my design?Link Copied
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Hi,
You can see the examples here. http://www.bitec.ltd.uk/ciii_video_dev_kit.html Also in one of the documents there is a table about the timings. What values of horizontal porch vertical porch should be used for different resolutions of image. Those timings values have worked fine for my design.- Mark as New
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I went through the examples but I couldn't find any example of run-time configuration for the CVO. The timing table is useful, but now I'm confused with the different Pclk MHz frequencies. I'm using a constant frequency of 100MHz for the CVO, how should I interpret these values then?
Thank you- Mark as New
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This is the one I found in one of the examples. And it has different values.
dl.dropbox.com/u/16438728/bitecVGAtiming.PNG- Mark as New
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Anyway, I've used different parameters but the problem is I get no output at all, my display enters sleep mode whenever I change the system video input. The CVO status bit is always 0 after writing the GO bit.
I also have a mixer with a TPG and a frame read from memory so I change the TPG resolution to the new one every time it changes after checking if the CVI is stable and has a valid resolution.
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