ADV7181B video decoder-facing color issue

Hi ,

Thanks for the reply .

Actually we are using FPGA in this project and whatever output coming from ADV7181B video decoder is input to FPGA and we will convert interlaced format to prograssive.

We initialized the video decoder as per attached file and i compared it with the file you sent (ADV7181C_ADV7181C@_ADV7341-VER.3.2c Refered "##CP 525p/625p##"). Wherever mismatch found, i made it as per in your file.

But there is no improvement in color.

Note :  If we use test pattern (Color Bars)  instead of vedio decoder input,We will get proper color display. So there is no problem with FPGA as i think.

Please kindly help me to solve the issue.

Thanks & Regards

Preeti

Hi ,

Thanks for the reply .

Actually we are using FPGA in this project and whatever output coming from ADV7181B video decoder is input to FPGA and we will convert interlaced format to prograssive.

We initialized the video decoder as per attached file and i compared it with the file you sent (ADV7181C_ADV7181C@_ADV7341-VER.3.2c Refered "##CP 525p/625p##"). Wherever mismatch found, i made it as per in your file.

But there is no improvement in color.

Note :  If we use test pattern (Color Bars)  instead of vedio decoder input,We will get proper color display. So there is no problem with FPGA as i think.

Please kindly help me to solve the issue.

Thanks & Regards

Preeti

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