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(ADV7480)What will happen when we change HDMI <=> Digital?

Question asked by donadona999s on Jul 10, 2016
Latest reply on Aug 16, 2016 by donadona999s


Hi !

 

I have some question about ADV7480.

Our customer are using ADV7480 for Automotive head unit.

When they change HDMI => digital => HDMI , the output turns to Black.

 

For example

   HDMI => OK

   ↓

   DIGITAL => OK

   ↓

   HDMI => NG(Black)

This happens to only few HDMI source.

 

 

We asked to our customer to check the MIPI power-up/down sequence but there was no problem.

Also we asked to them to check the HDMI status resister to check HDMI-Lock but there was no problem.

Also they said when they change HDMI => DIGITAL , the source equipment looks stopping the image.

So they think the source equipment problem.

 

But I couldn't understand why this happened.

When they change HDMI=>DIGITAL=>HDMI, they don't disconnect HDMI connecter , so the HPD is stable.

This means the source equipment cannot know ADV7480 is selecting DIGITAL input at that time.

 

When ADV7480 select DIGITAL input, is ADV7480 sending something to the source equipment?

Is there any advice about this?

 

Best regards

Kawa

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