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DM6467 Query: video capture and display resolutions 800x600(@75 fps)

Girisha SG
Intellectual 970 points

We want to support video capture and display resolutions 800x600(@75 fps) on DM6467, can we modify the driver and support this resolution(i.e. is modification is possible considering hardware and software limitations too)?  though currently capture and display driver does not support this resolution.

Thanks,

Girish

  • 0
    TI__Mastermind 37340 points

    DM6467's capture and display ports support a 90 Mhz maximum pixel clock hence this certainly seems feasible. 

          Pixel clock =  resolution (including blanking)   X    refresh rate

    For example, per SMPTE video standards, 720p @ 60 fps (frame size is 1650 x 750, of which 1280x720 is active video) requires a 74.25 MHz pixel clock as shown below

           (1650 x 750 pixels/frame) * 60 frames/sec = 74.25 Mpixels/sec = 74.25 MHz pixel clock.

    I do not recall of the top of my head blanking data requirements for an 800x600 (SVGA) video resolution or if your project has different requirements than the industry defined SVGA standard (I assume there is one).  But in general so long as your resolution (including blanking data) * refresh rate < 90 MHz max pixel clock supported, you should be ok. 

  • 0 in reply to Juan Gonzales
    Intellectual 970 points

    Thanks Jaun.

    Our project has different requirement than the industry defined SVGA standard.

    How can we calculate the frame size(which includes active video + blanking)

    DM6467's capture and display ports(VPIF) operates at 99 MHz on 594 MHz board, 108 MHz on 729 MHz board and hence we have to consider max pixel clock as 99/108MHz not 90 MHz am I right ?