Internal Error: Sub-system: CDB_SGATE, File: /quartus/db/cdb_sgate/cdb_sgate_wys_titan.cpp, Line: 5199

Description

You may encounter the internal error in the Quartus® II software when synthesizing your design if you use a module named LPM_ADD_SUB. This error occurs due to a conflict in synthesis with the Altera LPM_ADD_SUB module.

Resolution

To avoid this error, rename the LPM_ADD_SUB module in your design.