Article ID: 000074099 Content Type: Error Messages Last Reviewed: 05/15/2014

Error: The specified Memory clock frequency exceeds the Memory device speed grade of 533.333 MHz. Please increase the Memory device speed grade (in Memory Parameters tab) or decrease the Memory clock frequency.

Environment

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

    You may see the above error when generating a Stratix IV DDR3 UniPHY controller in the Quartus® II software version 13.1 or later. There is a new frequency check in the MegaWizard™ Plug-in Manager IP GUI that prevents users from running the interface faster than the maximum supported frequency. If you specify the maximum supported frequency with more than 3 decimal places (i.e. 533.3333MHz), it will lead to the above error.

    Resolution The workaround is to limit the DDR3 Memory clock frequency in the PHY Settings tab of the MegaWizard™ Plug-In Manager to three decimal places.

    Related Products

    This article applies to 3 products

    Stratix® IV GT FPGA
    Stratix® IV E FPGA
    Stratix® IV GX FPGA

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