The EDCRC false error known issue found in Stratix® IV device and Arria® II device families require instantiation of an Altera CRCERROR Verify v12.0 megafunction. However, the Altera CRCERROR Verify v12.0 megafunction is not available in the Quartus® II software version 12.0. During compilation of a design that uses the error detection CRC feature, the Quartus II software reports above error.
Refer to the Stratix IV device and Arria II device families errata sheet for the details on this EDCRC false error known issue.
If you require the Altera CRCERROR Verify v12.0 megafunction for the EDCRC false error solution in the Quartus II software version 12.0, install patch 0.04 from the following links:
This issue is scheduled to be fixed in a future version of the Quartus II software.