This problem affects DDR2 and DDR3, LPDDR2, QDR II, and RLDRAM II products.
UniPHY-based memory interfaces generated in the Quartus II software version 11.0 or later and targeting Arria II GZ, Stratix III, or Stratix IV devices will experience calibration failure if the following setting is included in the projects QSF file:
set_global_assignment -name RELEASE_CLEARS_BEFORE_TRI_STATES
For Uniphy-based memory interfaces generated in the Quartus
II software version 12.0 or later and targeting Arria II GZ, Stratix
III, or Stratix IV devices, the following message occurs during
timing analysis if
This design has the QSF assignment RELEASE_CLEARS_BEFORE_TRI_STATES set to ON. UniPHY IP in Stratix III and Stratix IV is not compatible with this setting. Set the RELEASE_CLEARS_BEFORE_TRI_STATES assignment to OFF to resolve the issue.