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  1. #1
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    ZCU111 Ultrascale+ RFSoC board

    Hello,
    I am currently working on the Ultrascale+ RFSoC board (ZCU111). I have a clock synchronization problem. I can neither synchronize the card and the spectrum analyzer with the 10 MHz reference signal from the spectrum analyzer, nor retrieve a reference signal from the card and put it at the input of the spectrum analyzer.
    I am trying to do a project containing signal processing and we need about 142 Hz of frequency accuracy. Hence the need for synchronization.
    It would appear that the reference signal on the card is at more than 3 GHz instead of 10-20 MHz (on J7 and J10).
    Here is a DAC measurement on the spectrum analyzer with a 100 Hz span.

    Click image for larger version. 

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    Click image for larger version. 

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    Thank you in advance if anyone have an idea or advice.

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  2. #2
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    Re: ZCU111 Ultrascale+ RFSoC board

    The reference clock connector won't output 10 MHz without appropriate PLL programming. Sure everything is setup correctly?



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  3. #3
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    Re: ZCU111 Ultrascale+ RFSoC board

    Thank you for your answer FvM.
    No, I'm not sure everything is well configured. I am new to this board and it is true that I have difficulty finding or decrypting information about this reference clock. I'm trying to make a Standalone application to manage RF converters. (Hardware on Vivado, use the API drivers to check the correct configuration). As far as clkout5 is concerned, I don't really see how to program it. There are very few examples of clocks programming. I want to use the ADCs at a sampling frequency of 4 GHz. But for this clock reference I'm blocking.

    Thank you.



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