Article ID: 000079808 Content Type: Troubleshooting Last Reviewed: 09/11/2012

Why doesn't the Stratix phase-locked loop (PLL, altpll megafunction) lock in a Verilog HDL functional simulation using ModelSim versions 5.7 and 5.7a?

Environment

  • PLL
  • BUILT IN - ARTICLE INTRO SECOND COMPONENT
    Description The Mentor Graphics® ModelSim 5.7 and 5.7a releases have a problem with Verilog HDL non-blocking assignments that have variable delays that are zero in value (e.g. cout_tmp <= #(time_delay) tmp_cout; where time_delay = 0). The bug results in incorrect simulation results for the Stratix® altpll functional simulation model in the altera_mf.v file.

    The problem has been fixed in Mentor Graphics ModelSim version 5.7b release.

    Related Products

    This article applies to 1 products

    Stratix® FPGAs

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