When you have ECC enabled with Auto Correction in your DDR3 UniPHY memory controller, you may see that the UniPHY Auto Correction Drop (CORDROP_ERROR) register contains a non-zero value. This register will increment when the error address FIFO in the controller is full, and the controller is not able to schedule an auto correction command.
Device Family: Arria® V GT, Arria® V GX, Arria® V GZ, Arria® V ST, Arria® V SX
Area: EMIF, Intellectual Property
IP Product: DDR3 SDRAM Controller MegaCore supporting UniPHY