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Altera_Forum's avatar
Altera_Forum
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13 years ago

horizontal blanking problem with D5M on tPaD board

I am having the following problem with the duration of horizontal blanking at the D5M's output. I have tried two image sizes with the same result, 1920x1080 and 800 x 600, no binning. Horizonta...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
13 years ago

I noticed some more strange things, even with the original tpad_camera design.

According to the user manual, expexted frame rate is xa 44 fps.

resolution is 800 x 600, row and column binning...

This frame rate corresponds to the equations from the user manual, ie HBMIN value = 500 and horizontal blanking should last 1000 clock cycles.

BUT, looking at LVAL in SignalTapII, I see that horizontal blanking lasts for 1552 clock cycles!

Please advise, I need to use D5M to output 1920x1080 HD @ 30 fps and have no idea how to do it. As I wrote above, horizontal blanking is always 900 pixels when not binning whatever frame width. This is too high so I cannot get 30fps by varying Vblank.