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ADV7181B video decoder-facing color issue

Hi ,

Im working on PAL to VGA conversion, Im using  adv7181 Multi-format SDTV video decoder. Im facing  color problem (getting only black and white display)

Im capturing the picture though camera and  this PAL video is given to adv7181b,Im getting  VGA display without color.

is there any color related register configuration i need to do to solve this color issue ?

  

Can u please help me to resolve this issue.

Thanks

FPGA Engineer

Parents
  • 1) Is there >2ms wait after 0F <- 01 write; the reset pulse

    2) Have you tried other VID_SEL values in case your source is not what you expect, like 00

    3) Do you see the signals transition on the YCbCr digital channels

    4) Make sure VID_STD & PRIM_MODE are correct, write 05 <- 00, 06 <- 02

    5) 3A <- 17, you can power down ADC3 also, probably bug in script but it doesn't hurt anything

    6) is the input PAL signal the right amplitude, if the color burst is too low then it will not have color

Reply
  • 1) Is there >2ms wait after 0F <- 01 write; the reset pulse

    2) Have you tried other VID_SEL values in case your source is not what you expect, like 00

    3) Do you see the signals transition on the YCbCr digital channels

    4) Make sure VID_STD & PRIM_MODE are correct, write 05 <- 00, 06 <- 02

    5) 3A <- 17, you can power down ADC3 also, probably bug in script but it doesn't hurt anything

    6) is the input PAL signal the right amplitude, if the color burst is too low then it will not have color

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