ID:176196 Can't place fast PLL <name> in fast PLL location <name> -- not enough differential I/O pin locations available in fast PLL location <name>

CAUSE: The Fitter tried to place the specified fast PLL in the specified location. However, not enough differential I/O pin locations are available in the location. As a result, the Fitter could not place the fast PLL.

ACTION: Change the location assignment for the fast PLL or its differential I/O pins, or modify the design to reduce the number of differential I/O pins driven by the fast PLL.