Article ID: 000081488 Content Type: Troubleshooting Last Reviewed: 01/01/2015

Are there any know issues with AltMemPHY IP with mutliple rank external memory systems?

Environment

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

    Yes, when using Quartus II software version 9.1 and above there can be errors during read and writes to the external memory before or after a rank change. These are caused by certain driver patterns that result in the High Performace Controller II issuing commands at incorrect time intervals.  

    This can affect all multi-rank memory designs.

    To fix this issue, alt_ddrx_timing.v file in your project needs to be replaced with the attached corrected alt_ddrx_timing.v file. Be sure to do this everytime the IP is regenerated.

    This issue will be fixed in the future version of Quartus II software.

    Related Products

    This article applies to 1 products

    Stratix® FPGAs

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