Critical Issue
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 project’s QSF file:
set_global_assignment -name RELEASE_CLEARS_BEFORE_TRI_STATES
ON
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 RELEASE_CLEARS_BEFORE_TRI_STATES is
set to ON:
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.
In all cases, the workaround for this issue is to ensure that the keyword is set to OFF:
set_global_assignment -name RELEASE_CLEARS_BEFORE_TRI_STATES OFF