video loop back

[azhagiris]

We are using a Texas instruments TMS320DM6446 Evaluation module. we are running example code given by spectrum digital inc.
http://c6000.spectrumdigital.com/davincievm/revf/files/davincievm.zip

the video loop back code. the output of the board is not stable,video is jumping.

but with the examples of color bar proper output is seen.

video input is s-video or composite 1vpp/75ohm PAL Standard
Video output is composite output.

the camera output is pal standard 1vpp/75ohm.this we are feeding in to demo board, board output is connected to standard television.

[pandy]

I would check wiring, grounding loop, separation, sync slicer, clamping settings... (video can be AC or DC coupled, some electronics require explicitly AC coupling).

[azhagiris]

1.wiring connectivity

camera output is (PAL) BNC. FROM the camera output bnc to composite converter is there. then this input is given to the board s-video port. board composite output is connected to tv.

the image i attached.

2. both evaluation module and tv ground are looped properly, i.e supplying from the same source.

[pandy]

It looks like wrong/incorrect configuration of the TMS320DM6446.
I would go for detailed configuration checking - and i recommend myTI forum section - probably answer can be delivered significantly faster (perhaps unique sequence or some workaround for some HW quirk required).

[azhagiris]

we have raised the same quiries in ti e2e forum also, but we didn't get solution. further what kind of progress we can do, settings etc..

[azhagiris]

thank u for ur guidance. by the proper configuration of the decoder we get the clear output..

azhagiri