ID:51003 Port error: Output port <value> cannot be used without input port <value>

CAUSE: You specified the specific port of the altddio_out megafunction. When using the altddio_out megafunction, the specific port needs the input port to drive. This error usually occurs when you instantiate a megafunction directly in a text file rather than using the MegaWizard Plug-In Manager .

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