Article ID: 000080205 Content Type: Troubleshooting Last Reviewed: 08/21/2012

Why I am seeing the following warnings when I try to run RTL simulation using 3rd party DDR3 vendor model in Modelsim?

Environment

  • Quartus® II Subscription Edition
  • BUILT IN - ARTICLE INTRO SECOND COMPONENT
    Description

    You will see the following warnings when trying to simulate a DDR3 SDRAM UniPHY based controller generated in Quartus II software version prior to 11.1 with vendor memory model:

    # {hierarchy path}.cmd_task at time 50005156.0 ps WARNING: 500 us is required after RST_N goes inactive before CKE goes active.

    # {hierarchy path}.reset at time 50027031.0 ps WARNING: 200 us is required before RST_N goes inactive.

    Resolution

    This is due to skip and quick calibration option in the megawizard which will not simulate the full required times for initialization and calibration.

    From Quartus® II software version 11.1 onwards, there is an option for full calibration which will eliminate these warnings.

    Related Products

    This article applies to 2 products

    Stratix® V GX FPGA
    Stratix® V GT FPGA