ID:176158 Fast PLL <name> has <number> Mbps differential I/O data rate, but target device with <name> speed grade can support only <number> Mbps maximum differential I/O data rate

CAUSE: The Fitter tried to place the specified fast PLL, which has the specified differential I/O data rate. However, the target device with the specified speed grade can support only the specified maximum differential I/O data rate. As a result, the Fitter could not place the fast PLL.

ACTION: Modify the design so that the differential I/O data rate is less than or equal to the specified maximum differential I/O data rate for the target device of the specified speed grade, or select a device with a faster speed grade.