ID:176344 Can't support CPRI Protocol in C5 speed grade devices

CAUSE: The design contains a gigabit transceiver block (GXB) using the CPRI Protocol and you selected a C5 speed grade device. However, C5 speed grade devices cannot support GXB transceivers using the CPRI Protocol because of the timing constraints on these devices.

ACTION: Choose another device with a faster speed grade.