Article ID: 000081742 Content Type: Troubleshooting Last Reviewed: 01/01/2015

Why is Quartus II software implementing two Stratix II device MRAM blocks when configuring my RAM in x128 or x144 modes if the MegaWizard Plug-In Manager reports only one MRAM will be used?

Environment

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

    When targeting Stratix® II device MRAM blocks in ×28 and ×44 modes, byte enables are only supported when using single clock mode. If you implement the memory in x128 or x144 mode with byte enables and dual clocks, Quartus® II software will implement a workaround that will allow you to configure the memory in this mode. Doing so will double the resources consumed by this RAM.

    The correct resource usage is reflected in the Quartus II software MegaWizard® Plug-In Manager version 7.1 and later.

    Refer to the Stratix II FPGA Family Errata Sheet (PDF) for more information.

    Related Products

    This article applies to 2 products

    Stratix® II FPGAs
    Stratix® II GX FPGA

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