The DDR3 SDRAM High Performance Controller MegaCore in Quartus® II software versions 9.0 SP2 and earlier issues read-modify-write (RMW) commands with incorrect data when the ECC feature is enabled. This controller problem can result in invalid data being written into the memory device and cause functional failures.
Patch 2.06 is available to fix this problem in the Quartus II software version 9.0 SP2. If you are using version 9.0 or 9.0 SP1, first download and install the Quartus II Software version 9.0 Service Pack 2. Download the appropriate Quartus II software version 9.0 SP2 patch 2.06 from the following links:
To fix the problem, regenerate and recompile all instances of the DDR3 SDRAM High Performance Controller MegaCore in your design using the updated Quartus II software.