ID:15512 External clock ports of enhanced PLL "<name>" are driving <number> pairs of output pins -- external clock ports cannot feed more than four pairs of output pins

CAUSE: The external clock ports of the specified enhanced PLL drives the specified number of output pins. However, the enhanced PLL cannot feed more than four pairs of 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 enhanced PLL does not feed more than four pairs of output pins.