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ADV7842 LLC phase can't be changed

Question asked by Longz on Sep 21, 2017
Latest reply on Sep 25, 2017 by GuenterL

We use attached file named "OK-CVBS-ADV7842-BT656.txt" to check in EVAL-ADV7842-7511-P board, it's correct.Now, we put it into our board with ADV7842, it's very unreliable.the vide data like Figure 1 very casually can be observed.Figure 2 and 3 is sequential waveforms of ADV7842 output.The red line is pixel clock, the yellow is data clock.FAE of receive chip manufacturer said, the phase of pixel clock need adjust to imporve reliability.But we try to modify LLC_DLL_EN/LLC_DLL_MUX /LLC_DLL_PHASE, the change of sequential waveforms is not observed.Please hellp us,thanks.

 

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