AnsweredAssumed Answered

ADV7441A Auto Graphic Mode Settings!

Question asked by johnsonlee on May 10, 2011
Latest reply on May 19, 2011 by DaveD

Hi all,

I am using this ADV7441a for VGA input and as it doesn't provide a lot VESA timing, I implemented using Auto-Graphic Mode.

 

Here we have an emergency problem and need your comments.

 

For example, we input VGA at 1024x768, 60Hz in auto graphic mode with STDI and SSPD function.

The output will lost lock after 1 hour burn-in and back to normal within 1~2 seconds.

 

What I observed is, User Map 0x12 "TLLC PLL LOCK", unlocked..

 

In HW manual, there description about PLL_DIV_MAN_EN and PLL_DIV_RATIO on STDI mode.

 

What I want to know is, "VCO_RANGE 0x8A and "PLL_QPUMP 0x3C, shoule I make any change on this Manual Mode.

 

Otherwise how could I debug this problem?

 

BRs,

Johnson

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