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ymiler's avatar
ymiler
Icon for Contributor rankContributor
2 years ago

clock missing

Hi, I have defined several clocks for my design, but the tool has removed some of them. Quarus (ver 22.3) found these clocks, but I'm unsure why they are not included in the final clock list. I'd ...
Hdl
Nurina's avatar
Nurina
Icon for Regular Contributor rankRegular Contributor
2 years ago

Hi,


Could it be that the SDC is being ignored? Try reporting "Ignored Constraints" in Timing Analyzer to see if they are being ignored.


Let me drop you an email and see if you can send it through there.


Regards,

Nurina


  • FvM's avatar
    FvM
    Icon for Super Contributor rankSuper Contributor
    2 years ago
    Inputs that are acting as actual clock won't be removed, no matter if they are correctly constrained. Clocks are removed (like other logic) if no design output depends on it.
    • ymiler's avatar
      ymiler
      Icon for Contributor rankContributor
      2 years ago

      I found the issue,

      I got a critical error:

      " Ignored create_generated_clock , Argument -source is a collection with more than one object. "

      It needs more investigate since my ENV includes Synplify Premier for synthesis and Quartus for P&R

      Synplify Premier show me the clock definition correctly but the production files for Quartus include constraint with

      more than 1 source objects.

      Maybe I should check it with Synplify support team.