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Altera_Forum's avatar
Altera_Forum
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15 years ago

scaler problem

Hi, I have another problem about scaler, it's right that adding a control port to scaler makes the input resolution changable, but some resolution doesn't work. My data path is listed below. Clo...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
15 years ago

Hi All,

I'm also having some issues with implementing a scaler video path for upscaling. The following resolutions all at 60Hz are what I'm testing with:

1280x1024 -> 1600x1200 : OK

1024x768 -> 1600x1200 : OK

800x600 -> 1600x1200 : breaks

So for the 800x600 -> 1600x1200 case I can lower the output clock (which is not the correct display clock for this resolution) and get an image out that is not at the right frame rate. This would suggest a throughput issue.

The video path is the following:

CVI -> SCALER -> FB -> CVO

The CVI has 18,000 pixels of FIFO and the Scaler has 12 taps. My guess was 11 x 1600 pixels to be enough CVI FIFO; is it? I read the CVI overflow bit, and it looks OK.

Any suggestions would be very much appreciated.

Thanks,

Mike