ID:84023 only one loopback port is supported in altmult_add megafunction with <name> device family in the operation mode <name>

CAUSE: The bit width you specified for the altmult_add megafunction is illegal. 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.