ID:84053 When inputs are 18 bits and output is 37 bits in sum2 mode, the MSB is generated by logic cell, no rounding and saturation support

CAUSE: You selected a specific value of the specified parameter in the altmult_add megafunction; however, the value of this specific parameter is not supported in this device family for the specific mode. 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.