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anonimcs's avatar
anonimcs
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2 years ago
Solved

Clock groups ignored by Timing analyzer

Hi all, I have a design with multiple clock domains. I want to ignore the timing checks for the paths where CDC happens. For this purpose, I have set clock groups in my sdc file, code can be found b...
Timing
  • anonimcs's avatar
    anonimcs
    2 years ago

    The issue was that the .sdc file was read before all the other .ip files are read in the .qsf file. When I moved the line to read the .sdc file after reading the .ip files, the issue is gone, and I can see false paths set in the report for clock transfers. This issue was also mentioned in this article here. In case the link becomes broken in the future, I attach a screenshot of the link content below.

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

The issue was that the .sdc file was read before all the other .ip files are read in the .qsf file. When I moved the line to read the .sdc file after reading the .ip files, the issue is gone, and I can see false paths set in the report for clock transfers. This issue was also mentioned in this article here. In case the link becomes broken in the future, I attach a screenshot of the link content below.