Why do I see an efficiency issue when using the Arria® V and Cyclone® V hard memory controller with DQS tracking enabled?

Description

Arria® V and Cyclone® V DDR2,  DDR3/3L, and/or LPDDR2 designs with DQS tracking enabled may see reduced efficiency due to a long DQS tracking process where there is no periodic refresh being issued by the hard memory controller for a long period of time.

Resolution

Enable user auto-refresh options in the UniPHY IP.