V. Frontporch

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  • February 16, 2017 at 10:25 AM #11282
    Harrumph
    Participant

      Heya. So finally I managed to get a picture in Lx5 with my SNES (Gamecube with GBI worked already without adjustment).

      I used 1920×1200 mode and then reduced V.Active to 216 to trick my TV that it’s a 1920×1080 PC signal. I then have to reduce V. Backporch down to 2 to get the image to display.
      Here’s the problem though.

      The image is too far down on the screen, and I can’t increase V. Backporch to adjust because then the display loses picture.
      However, this leads me to believe that if I could increase V. Frontporch, then I could adjust it to center. Is my thinking correct?

      Actually, there is a similar problem for Lx4 mode, which I also had to adjust (Increase V.Active to 256 for a 1280×1024 PC signal), but not at all as severe as the image does not fill the screen anyway, the picture is just slightly off-center.

      Any chance V. Frontporch adjustment can be added in next FW update? What’s the reason Frontporch adjustments were left out in the first place, is it a memory contraint?

      Cheers Marqs, amazing product and this latest FW is incredibly good already!

      February 18, 2017 at 3:40 PM #11369
      marqs
      Participant

        V.Frontporch = V.total – (V.Backporch + V.active + V.synclen). V.total and V.synclen are defined by source and line multiplication mode, but the latter would not necessarily need to be, so I’ve already planned to add V.synclen as a customizable parameter. It might help here, but ideally a customized vsync start offset (currently locked to source) would allow more vertical position adjustment.

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