Error (272006): Invalid setting: NUMBER_OF_MULTIPLIERS is greater than 1 for PREADDER_MODE=INPUT - Error (272006): Invalid setting: NUMBER_OF_MULTIPLIERS is greater than 1 for PREADDER_MODE=INPUT Description Due to a problem in the Quartus® II software version 11.0 and later, you may see this error when compiling designs targeting Stratix® V, Arria® V, and Cyclone® V devices. This error occurs if you used the MegaWizard™ Plug-In Manager to create an ALTMULT_ADD megafunction with 2 or more multipliers and preadder mode selected as Input . Resolution To work around this problem, use HDL code to infer the required functionality. A VHDL example for sum-of-two multipliers with preadder is provided below. This example may be modified to support other configurations. Additional templates are available within the Quartus II Text Editor. For further information, see Recommended HDL Coding Sytles (PDF) in the Quartus II Handbook. preadder_input.vhd This problem is fixed beginning with the Quartus II software version 12.0. Custom Fields values: ['novalue'] Troubleshooting novalue False ['novalue'] ['FPGA Dev Tools Quartus II Software'] 12.0 11.0 ['Arria® V GT FPGA', 'Arria® V GX FPGA', 'Arria® V ST FPGA', 'Arria® V SX FPGA', 'Cyclone® V E FPGA', 'Cyclone® V GT FPGA', 'Cyclone® V GX FPGA', 'Cyclone® V SE FPGA', 'Cyclone® V ST FPGA', 'Cyclone® V SX FPGA', 'Stratix® V E FPGA', 'Stratix® V GS FPGA', 'Stratix® V GT FPGA', 'Stratix® V GX FPGA'] ['novalue'] ['novalue'] ['novalue']