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\'.