Why does the external memory interface calibration hang after a CvP update when using the DDR3, DDR2 or LPDDR2 UniPHY hard memory controller?

Description

Due to a problem in the Quartus® II software, when configuring a SOF file through the Configuration via Protocol (CvP) method with a design that includes the UniPHY hard memory controller, you may observe that calibration fails after the CvP update occurs. The external memory interface calibration status signals local_cal_fail and local_cal_success never become asserted.

This issue occurs because the content of the M20K/M10K RAM memory used for the calibration process was corrupted after the CvP update.

Resolution

Contact Intel® for details of the workaround.