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515 Views
Registered: ‎07-10-2018

HDMI 2.0 Transmiter (v3.1) FPS limitations

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I have an application that calls for 120FPS on a Kintex Ultrascale+ or MPSOC+ device. The HDMI documentation lists only 1920x1080p 4:4:4 support for 120FPS. The driver lists a 2560x1080p 4:4:4 120FPS. HDMI 2.0 should support 2560x1440 at 120Hz and even 3840x2160 at 120FPS using 4:2:0.

Are there known limitations (bits per second, pixels per second, or frames per second) in the IP with supporting 120FPS as long as the HDMI link supports the required bandwidth?  I assume one can add a custom timing to the driver table.

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Xilinx Employee
Xilinx Employee
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Registered: ‎08-02-2007

Re: HDMI 2.0 Transmiter (v3.1) FPS limitations

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@andrew.hansford

If the pixel clock is supported by CPLL or QPLL, You can make it work by adding your custom resolution, we have documented more details in AR : https://www.xilinx.com/support/answers/71965.html

For details on how to calculate the pixel clock, please refer to clocking section (page 45 and onwards) of https://www.xilinx.com/support/documentation/ip_documentation/v_hdmi_tx_ss/v3_1/pg235-v-hdmi-tx-ss.pdf

 

 

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Scholar watari
Scholar
493 Views
Registered: ‎06-16-2013

Re: HDMI 2.0 Transmiter (v3.1) FPS limitations

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Hi @andrew.hansford

 

> Are there known limitations (bits per second, pixels per second, or frames per second) in the IP with supporting 120FPS as long as the HDMI link supports the required bandwidth?

 

Yes.

BTW, what the HDMI Sink ? Also, do you need to consider compatibility ?

If yes, I strongly recommend CEA video timing.

You can find target video timing in CEA video timing table.

 

Best regards,

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485 Views
Registered: ‎07-10-2018

Re: HDMI 2.0 Transmiter (v3.1) FPS limitations

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>Yes.
>BTW, what the HDMI Sink ? Also, do you need to consider compatibility ?
>If yes, I strongly recommend CEA video timing.
>You can find target video timing in CEA video timing table.

Thanks for your reply. Are you saying the IP can only support the modes and timings in CEA-861-G And not other common timings (like 2560x1440p at 120Hz)?

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Scholar watari
Scholar
451 Views
Registered: ‎06-16-2013

Re: HDMI 2.0 Transmiter (v3.1) FPS limitations

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Hi @andrew.hansford

 

> Are you saying the IP can only support the modes and timings in CEA-861-G And not other common timings (like 2560x1440p at 120Hz)?

If you consern compatibility in HDMI world, this answer is yes.

If you don't concern it, the limitation is band width and pll working range at HDMI sink.

 

Best regards,

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

Re: HDMI 2.0 Transmiter (v3.1) FPS limitations

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@andrew.hansford

If the pixel clock is supported by CPLL or QPLL, You can make it work by adding your custom resolution, we have documented more details in AR : https://www.xilinx.com/support/answers/71965.html

For details on how to calculate the pixel clock, please refer to clocking section (page 45 and onwards) of https://www.xilinx.com/support/documentation/ip_documentation/v_hdmi_tx_ss/v3_1/pg235-v-hdmi-tx-ss.pdf

 

 

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Moderator
Moderator
375 Views
Registered: ‎11-09-2015

Re: HDMI 2.0 Transmiter (v3.1) FPS limitations

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Hi @andrew.hansford,

Do you have any updates on this? Were the answer provided enough for you?

If your question is answered or your issue is solved, please kindly mark the response which helped as solution (click on "Accept as solution" button below the reply)

If this is not solved/answered, please reply in the topic giving more information on your current status.

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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370 Views
Registered: ‎07-10-2018

Re: HDMI 2.0 Transmiter (v3.1) FPS limitations

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The custom resolutions should work fine.  These seems to be the same issue machines had driving 2560x1440 monitors over HDMI.  That resolution is not officially in the CEA specification. I also noticed that Xilinx has announce an HDMI 2.1 Transmitter which I expect to support 120Hz at 3840x2160.

 

Thanks 

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