Article ID: 000082851 Content Type: Error Messages Last Reviewed: 09/02/2014

Error: The parameter MEM_CS_WIDTH (Number of chip-selects per device/DIMM) must be set to 2 or greater for RDIMM/LRDIMM devices

Environment

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

    You may experience the above error when the Memory Format option is set to Registered DIMM for your DDR2 UniPHY-based controller in the Quartus® II software version 12.1 and later. The error occurs when the Number of chip-select per device/DIMM option is set to 1. 

    Resolution

    The workaround is to generate the DDR2 UniPHY-based controller with two chip-selects and ignore the second chip-select signal from the controller.

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

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