ID:15510 Port "<name>" of enhanced PLL "<name>" can only feed output pins

CAUSE: The specified port of the specified enhanced PLL feeds something other than a pin. However, the specified port of the enhanced PLL can only feed output pins. This error usually occurs when you instantiate a megafunction directly in a text file rather than using the MegaWizard Plug-In Manager .

ACTION: Modify the design so that the port feeds only output pins.