21-02-2017, 07:19 AM
My gut feeling is that you'll run out of resources in the PLD when you try to do an interpolator. When down converting (to a lower number of lines) the simplest way to do interpolation is to have line delay(s) on the input standard. The interpolated lines are then written to the time redistribution memory. With framestores it's possible to interpolate after the time redistribution which is what I think you're trying to do.
On my own experimental converter I used ordinary SDRAM to create the appearance of a framestore with a single video write port and multiple (up to 4) video read ports. I then interpolated at the output standard. I had developed the techniques for my professional designs and had the relevant hardware available. I had written all lthis up in some detail elsewhere but unfortunately this information has been destroyed. I still have all the design files and notes but they aren't in a form that could readily be published.
On my own experimental converter I used ordinary SDRAM to create the appearance of a framestore with a single video write port and multiple (up to 4) video read ports. I then interpolated at the output standard. I had developed the techniques for my professional designs and had the relevant hardware available. I had written all lthis up in some detail elsewhere but unfortunately this information has been destroyed. I still have all the design files and notes but they aren't in a form that could readily be published.
www.borinsky.co.uk Jeffrey Borinsky www.becg.tv
