AnsweredAssumed Answered

ADV7611 Output Clock Instability and Overheating w DVI or HDMI Source Input

Question asked by danngai on Dec 1, 2014
Latest reply on Dec 5, 2014 by GuenterL

Hello,

 

Thank you in advance for your help on this.  I am using the ADV7611 device for HDMI Reception and have encountered some problem.  I am including the setup conditions and problems.  I am also attaching the scripts used [from Engineer Zone] that were used to setup the registers of the ADV7611.   Thank you!

 

Dan

 

Background/Conditions

  • Copied design directly from Dev Board [copy of schematic will be sent upon request]
  • ADV7611 connected straight into FPGA
  • Successful communication to ADV7611 via I2C
  • Can bring ADV7611 out of reset via I2C
  • Read/Write to any of the MANY MANY registers in ADV7611
  • Copied and used most recent PUBLISHED SCRIPTS for setting registers [directly from Engineering Zone]
  • Without HDMI or DVI input, has successfully set up ADV7611 to free run and and output Pixel, HS, VS clocks are correct and within specification
  • Can set up via I2C any of the various resolutions and frame rates with accurate Pixel, HS, VS clocks on the output of the ADV7611

 

HDMI Source Input

  • Using Published Scripts for setting registers [see attachment]
  • ADV7611 set to 720p60
  • ADV7611 set to Free Run
  • HDMI Hot or Cold Plugin

 

HDMI SOURCE PROBLEM:

  • Pixel Clock, HS and VS Clocks unstable and don’t lock to correct frequency value
  • ADV7611 heats up within 1-2 Seconds and must be SHUT DOWN to avoid damage

 

 

DVI Source Input

  • Using Published Scripts for setting registers
  • ADV7611 set to 720p60
  • ADV7611 set to Free Run
  • HDMI Reset set to Ignore [No Hot Plug Detect]

 

DVI SOURCE PROBLEM:

  • Can see TMDS Clock
  • HOWEVER, Pixel Clock, HS and VS Clocks unstable and don’t lock to correct frequency value
  • ADV7611 heats up and eventually must be shut down to avoid overheating

Attachments

Outcomes