Article ID: 000073681 Content Type: Troubleshooting Last Reviewed: 06/18/2012

No-Fit in DDR3 Interfaces Due to mem_ck Assignments

Environment

  • Quartus® II Subscription Edition
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    Critical Issue

    Description

    This problem affects DDR3 products.

    A DDR3 memory interface that compiled successfully in version 11.1 of the Quartus II software may encounter a no-fit in version 12.0 if mem_ck is assigned to a differential pin pair where p is inside a DQS group and n is outside the DQS group.

    Resolution

    The workaround for this issue is as follows:

    1. Open the file xxx_addr_cmd_pads.v in a text editor.
    2. Search for the localparam USE_ADDR_CMD_CPS_FOR_MEM_CK and set its value to true.

    This issue will be fixed in a future version.

    Related Products

    This article applies to 1 products

    Intel® Programmable Devices

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