OSSC 10 bit input from TVP7002

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  • January 27, 2026 at 8:37 PM #68453
    Rom
    Participant

      Hi 🙂 I’m trying to work on some conversion code using the ossc and I was wondering why the fpga inputs from the TVP7002 are 8 bit only as the 7002 outputs 10 bits. I’ve tried to check my board and apparently those pins are connected? (although is pretty hard to see and I’m not sure I’m correct). Can anyone shed a light on the subject? Thank you 🙂

      January 27, 2026 at 9:52 PM #68457
      Zacabeb
      Participant

        Looking at the schematics, it seems that the two LSBs of each component from the TVP7002 are just floating.

        https://raw.githubusercontent.com/marqs85/ossc_pcb/v1.8/doc/ossc_board.pdf

        From what I gather, 30-bit color would require more bandwidth and GPIO pins than the FPGA has available.

        January 27, 2026 at 10:47 PM #68461
        Rom
        Participant

          Hmm I think you are correct. I checked the page with the TVP and saw the pins there but didn’t see the one with the FPGA. I tried to follow the traces on my board and came here asking. Anyway, I think what I wanted to achieve is impossible. My idea was to patch the PCE palette just like the NES/Atari ones for correct RGB colors but I think at the point the RGB signal is output the palette is useless. Oh well, thanks anyway.

          January 27, 2026 at 10:47 PM #68462
          marqs
          Participant

            They are indeed unused. Main reason is that there was not enough pins on the FPGA (a second set of 6 pins would also be needed on the output interface towards HDMI TX) and it wasn’t originally designed to go much beyond 2x scandoubling.

            January 28, 2026 at 12:29 AM #68466
            Rom
            Participant

              That makes sense, thank you though for your work on it and for taking the time to answer this 🙂

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