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KWang97's avatar
KWang97
Icon for Occasional Contributor rankOccasional Contributor
6 years ago

Timing Analysis not met on holdtime

Hold time slack is minus, so how to solve this problem? How can I meet Timing requirements. Some specific files about my project are attached. Please download and help me analyze it and hope for your solutions. Thanks very much!

“FPGA_CLOCK_25MHZ” is the 25MHZ input clock， “pll_clk_out_50 ” is clock generated by PLL IP which is 50MHz, and “pll_clk_out_50 ” didn't meet the Timing analysis.

3 Replies

  • skyjuice's avatar
    skyjuice
    Icon for Occasional Contributor rankOccasional Contributor
    6 years ago

    Can you do a report_timing on the violated path? This will pinpoint to what cause the hold violations.

    • KWang97's avatar
      KWang97
      Icon for Occasional Contributor rankOccasional Contributor
      6 years ago
      Hi How do a report_timing on the violated path? I don’t know how to get it, could you please show me specific steps on how to generate it. Thanks!
      • skyjuice's avatar
        skyjuice
        Icon for Occasional Contributor rankOccasional Contributor
        6 years ago

        Open Timing Analyzer, update timing netlist, and there will be a list of timing violations. Right click on the violated clock and click ‘Report Timing’. Export out these violated paths.