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(ADV7390)To support 720*480p 27MHz DDR.

Question asked by donadona999s on Jun 3, 2016
Latest reply on Jun 8, 2016 by donadona999s

Hi !

 

I have a question about ADV7390.

1)

To support 720*480p 27MHz DDR  with Vsync and Hsync, resister 0x01 must set to 0x20.

=> to select ED/HD-DDR input.

Is this correct?

 

One of our customer are already using ADV7390 with 720*480p 27MHz DDR for more than 2 years.

But they set the resister 0x01 to 0x70.

=>ED (at 54 MHz) input.

But they have never seen the problem .

 

So they want to know which is correct.

0x01 => 0x20? 0x70?

Also they don't want to change the resister 0x01 => 0x70 , because they don't want to take the risk to change the software.

 

2)

Is it OK to use 0x70?

Is there any risk about this?

 

3)

Also can you tell me 0x70(=>ED (at 54 MHz) input.) works with 27MHz DDR system?

 

4)

Also they want to know that this resister setting is correct or not.

0x01     0x20

0x0B     0x00

0x30     0x00

0x31     0x01

0x33     0x40

0x35     0x00

0x39     0x20

0x40     0x00

0x58     0x00

0x59     0x00

0x5A     0x00

0x5B     0x00

0x5C     0x00

0x5D     0x00

Can you give some advice about this?

 

5)

0x39 bit5 = ED/HD EIA/CEA-861B synchronization compliance

What is this for?

Can you explain about this?

We want to know this because even if we change this resister , nothing happens.

 

I know that sample script is very important but if you can give us some advice , it will help us very much.

 

 

Best regards.

Kawa

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