AnsweredAssumed Answered

ADV7842 Problem with CP

Question asked by s.gremba on May 19, 2011
Latest reply on Oct 4, 2013 by mattp

Hello.

 

I've problem with ADV7842 with component YUV input in SD resolution.

I use recommended register settings from ADV7842-VER.5.9c.txt script file downloadad from this forum.

 

The problem is when I analyse picture quality with Tektronix WFM7100 Video Analyser.

Color bar test pattern generator is connected to the input of ADV7842, wich is connected to the ADV7393 encoder, and then to the Tex Video Analyser.

 

Picture below shows screenshoot from vector-scope:

vector_bad.JPG

 

It looks like there is some probelm with decimation filters from 4:4:4 to 4:2:2. So I tried to change some setting, and I accidently found that setting bit 1 in register 68 (CP map) solves this problem.

 

...

44 68 f2

...

 

vector_ok.JPG

 

But in fact this bit is undocummented, and I don't know is this setting is correct. This problem is only when i use CP, in SDP everything is ok. I'm sure that output encoder (ADV7393) is initialized correctly.

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