ID:167021 <name> "<name>" can't be placed at location <name>. This location cannot route to the GXB PLL cascade network, which is necessary to drive the following <name> atom(s).

CAUSE: The specified core PLL cannot route to the gigabit transceiver block (GXB) PLL cascade network, but it needs access to the network in order to drive the specified GXB PLLs.

ACTION: Remove any location assignments on the specified core PLL or assign it to a different location that can drive onto the GXB PLL cascade network.