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bhunt's avatar
bhunt
Icon for New Contributor rankNew Contributor
4 years ago

Quartus Prime timing analyzer identifying reset nets as clocks

Hi there,

I'm having an issue with timing analyzer in Quartus Prime 18.1_SP1. (I'm forced to use this version for product software acceptance reasons).

A few reset nets are detected as clock nets, and show up in the Unconstrained Clocks report. How can I resolve this in the SDC constraints? Simply adding min/max delays doesn't resolve it (but I thought they would be appropriate for a reset net). I don't think it's helpful to define them as clocks since that would overconstrain the design.

Thanks,

Bhunt

7 Replies

  • sstrell's avatar
    sstrell
    Icon for Super Contributor rankSuper Contributor
    4 years ago

    I think you should look closer at why they are being interpreted as clocks. Can you post some code? If you have put resets in the sensitivity list with the intention to create asynchronous resets (my guess), you have to code them appropriately so they don't get interpreted incorrectly.

  • VenT_Altera's avatar
    VenT_Altera
    Icon for Frequent Contributor rankFrequent Contributor
    4 years ago

    Hi,


    Can you please attach your project .qar file here for us to evaluate?


    Thanks.

    Best Regards.


  • bhunt's avatar
    bhunt
    Icon for New Contributor rankNew Contributor
    4 years ago

    Is there an easy command to report all the clock loads (e.g. clock pins) on a net?

    • bhunt's avatar
      bhunt
      Icon for New Contributor rankNew Contributor
      4 years ago

      Thanks, this was very helpful! I'm all set.

  • VenT_Altera's avatar
    VenT_Altera
    Icon for Frequent Contributor rankFrequent Contributor
    4 years ago

    Hi,


    Do you have any updates on this?


    Thanks.

    Best Regards,

    Ven Ting


  • VenT_Altera's avatar
    VenT_Altera
    Icon for Frequent Contributor rankFrequent Contributor
    4 years ago

    Hi,


    I’m glad that your question has been addressed, I now transition this thread to community support. If you have a new question, feel free to open a new thread to get the support from Intel experts. Otherwise, the community users will continue to help you on this thread.


    Thanks.

    Best Regards,

    Ven Ting


    p/s: If any answer from the community or Intel Support are helpful, please feel free to give best answer or rate 9/10 survey.