ID:84028 When mode <name> has been selected with device family <name> output bit width can only be up to 36 bits when one of the input is unsigned.

CAUSE: The parameter value you specified for the altmult_add megafunction is illegal when the specific mode is used. This error usually occurs when you instantiate a megafunction directly in a text file rather than using the MegaWizard Plug-In Manager .

ACTION: To avoid receiving this message in the future, Intel recommends using the MegaWizard Plug-In Manager.