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video sync generator

Discussion in 'Electronic Design' started by nyffeler, Apr 30, 2004.

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  1. nyffeler

    nyffeler Guest

    For a special camera from Hamamatsu without internal sync generator I need to
    build an external video sync generator with the folowing specs.

    NON-Interlaced
    horizontal sync: periode 64us (15.625 kHz) pulswitdh 6 - 8 us
    vertical sync: periode 40- ms (25 Hz) pulswitdh 190 - 250 us

    Does anyone have an idea how to build such a thing?

    Peter
     
  2. On a sunny day (Fri, 30 Apr 2004 15:18:26 GMT) it happened
    Oh yes, I have one in FPGA, and you can find examples at many
    places of that like www.opencores.com or the Xilinx website.
    But there are some cheaps chips that do it all.
    Texas, National? Google a bit.
    JP
     
  3. Joerg

    Joerg Guest

    Hi Peter,

    Besides chips that do that there is another option if you are handy with micro
    controllers. You can configure the internal timers to generate these signals. For
    the MSP430 I believe the Texas app note about the "Pong game" shows how to do it.
    Probably has the code there as well. The nice thing with this solution is that
    you can fine tune the timing quite exactly to your needs, or even change it to a
    different video standard.

    Regards, Joerg
     
  4. Will

    Will Guest

    It's a little odd that you have to generate the sync signals for the sensor.
    I would expect it to generate the pixel clock by itself, and then another pulse
    to indicate the start of a frame. Anyway, the following app note is a quick
    intro to do VGA on an FPGA: http://www.xess.com/appnotes/vga.pdf. I remember
    reading about other folks doing NTSC with a PIC. Google for "PIC NTSC", oh
    here it is:
    http://www.rickard.gunee.com/projects/video/pic/howto.php.
     
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