Article ID: 000084385 Content Type: Troubleshooting Last Reviewed: 11/25/2013

ODT signal does not toggle when ODT Rtt nominal is off and Dynamic ODT (Rtt_wr) is on

Environment

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

    This affects DDR3 SDRAM memory controllers in Stratix® V devices.

    ODT signal does not toggle if in the DDR3 SDRAM MegaWizard™ GUI the value of ODT Rtt nominal is selected to 'ODT disabled'. When ODT nominal is disabled then no matter what value you select for Dynamic ODT, the ODT signal does not toggle.

    Resolution Make sure you select the same RZQ value for \'ODT Rtt nominal\' and \'Dynamic ODT\'.

    Related Products

    This article applies to 4 products

    Stratix® V GX FPGA
    Stratix® V GT FPGA
    Stratix® V E FPGA
    Stratix® V GS FPGA

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