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Explorer
Explorer
884 Views
Registered: ‎08-31-2016

HDMI: Minor glitches across the output and RX path issues

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Hi,

I'm working on an HDMI design based on the  Xilinx linux ZCU102 pass through example design. 

I'm observing minor glitches (white lines in the video) with a board and suspect the issue has to do with the HDMI RX side.

Also, In another board, HDMI RX data is not being received properly. I don't see the HDMI_hb helper core status toggling.

In working board, I do see this helper core status output (for RX path) toggling and design works fine at 4K 60fps. I have ensured that the hardware settings in both working and non working boards are kept same. 

Is it possible to change/tune the vphy controller parameters and solve this problem?

Regards,

Vinay Shenoy

Vinay Shenoy
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1 Solution

Accepted Solutions
Xilinx Employee
Xilinx Employee
637 Views
Registered: ‎08-02-2007

Re: HDMI: Minor glitches across the output and RX path issues

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 @vinay_shenoy was able to make it working by changing the HDMI RX Re-driver equalization settings for the custom boards.

7 Replies
Scholar watari
Scholar
863 Views
Registered: ‎06-16-2013

Re: HDMI: Seeing minor glitches across the output

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Hi @vinay_shenoy

 

Can you share this issue as a picture or a short movie ?

 

Best regards,

 

 

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Explorer
Explorer
854 Views
Registered: ‎08-31-2016

Re: HDMI: Seeing minor glitches across the output

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Hi @watari,

I will try to upload the picture of the glitch issue soon.

Do you have any inputs on the RX path issue?

Regards,
Vinay

Vinay Shenoy
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Moderator
Moderator
821 Views
Registered: ‎10-04-2017

Re: HDMI: Seeing minor glitches across the output

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Hi @vinay_shenoy,

 

In addition to the video requested from @watari, can you also add:

  1. The resolution when you see the issue.
  2. The series of FPGA?(7/us/us+) Is this a custom board or a development board?
  3. Is there any reporting/status from the RX software that may indicate an issue?
  4. What version of the core/tools are you using? (2017.4/2018.1/2018.2) 

Thanks,

Sam

 

 

Don't forget to reply, kudo, and accept as solution.

Xilinx Video Design Hub
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Xilinx Employee
Xilinx Employee
799 Views
Registered: ‎08-02-2007

Re: HDMI: Seeing minor glitches across the output

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@vinay_shenoy

I work offline on this issue with Vinay,

He has probed the HDMI RX cable clock (RX reference clock to VPHY ) and notices it stops and recovers for every 16sec or so. This is observed with 4K 60fps input.

He has confirmed that the RX HPD output will not toggle during the issue and remains asserted high.

In the meantime, the same clock remains stable with 4K 30fps input and the design works fine.

Is there anything in the design that could effect the reference clock to stop at certain times?

Xilinx Employee
Xilinx Employee
798 Views
Registered: ‎08-02-2007

Re: HDMI: Seeing minor glitches across the output

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At which point do you measure the clock? It normally indicates the quality of clock or HDMI cable. 

Video PHY has RX clock detection module, if the clock range is outside of the tolerance range, it won’t consider RX clock as a stable clock. 

Also you need to check if there is some problem with retimer on your board. What do you have on board between the RX TMDS clock from RX cable and the clock driven to FPGA? Please probe both clocks, and see if there is issue with retimer.

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Xilinx Employee
Xilinx Employee
638 Views
Registered: ‎08-02-2007

Re: HDMI: Minor glitches across the output and RX path issues

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 @vinay_shenoy was able to make it working by changing the HDMI RX Re-driver equalization settings for the custom boards.

Moderator
Moderator
563 Views
Registered: ‎11-09-2015

Re: HDMI: Minor glitches across the output and RX path issues

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Hi @vinay_shenoy,

As this issue is now solved for you, could you kindly close the topic by marking a reply as accepted solution?

Thanks and Regards,


Florent
Product Application Engineer - Xilinx Technical Support EMEA
**~ Don't forget to reply, give kudos, and accept as solution.~**
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