ID:186092 Can't place GXB clock input pin "<name>" because it drives a PLL that is not a GXB transmitter PLL or fast PLL -- pin must be placed inside quad due to I/O standard or location assignments

CAUSE: The specified gigabit transceiver block (GXB) clock input pin drives a PLL that is not a GXB transmitter PLL or fast PLL. The pin must be placed inside a quad due to I/O standard or location assignments. However, clock input pins that drive a PLL that is not a GXB transmitter PLL or fast PLL cannot be placed inside quads; they can be placed only in dedicated locations. As a result, the Fitter cannot place the GXB clock input pin.

ACTION: Delete or change the I/O standard or location assignment for the GXB clock input pin.