Settings for the equaliser gain on the RX side (zctrl and gctrl)

Hi,

  Apologies for the delayed response,

 As per expert's comment, The default scripts reflect the best setting as determined by testing for normal cables.  Long cables might require different equalization to compensate for the extra insertion losses.  

 HDMI specifications does not define cable length, it only defines transmitter load. Good cables can work over 10 meters while poor cable have problems working are 1 meter. The equalization settings are based on what's required for HDMI compliance at those specific frequencies.

 Also, If we tweak the EQ settings for a specific cable it might not work for other cables or configurations. 

Thanks,

Poornima S

Thank you for your reply.
I see. I had assumed that it had already been adjusted to the best possible settings.
I had encountered an issue where the TMDS signal was sticking to GND due to the specifications of the optical HDMI cable, so I thought this might be one possible solution, but it turned out to be unrelated.

Hi,

 Please refer this FAQ  HDMI Layout Guideline ,  This FAQ presents a general guideline to laying out HDMI traces on circuit boards. 

Thanks,

Poornima S

Hello,

Thank you for providing this information.
We have now carried out verification and assessment, and a solution has become apparent. This issue has been resolved.
Thank you.

Hi,

 Thanks for letting us know.

Thanks,

Poornima S