ID:16150 Ignored Input Delay from Pin to Internal Cells logic option assignment to input or bidirectional pin <name> because pin assigned to VREF pad <name>

CAUSE: You assigned the specified input or bidirectional pin to the specified VREF pad and assigned the Input Delay from Pin to Internal Cells logic option to the pin. The target device cannot support the pin because VREF pads do not support the Input Delay from Pin to Internal Cells logic option.

ACTION: Delete the location assignment or the Input Delay from Pin to Internal Cells logic option assignment to the pin.