Clocking Differences from Previous FPGA Generations

UltraScale Architecture Clocking Resources User Guide (UG572)

Document ID
Release Date
1.10.2 English

UltraScale architecture-based devices have significant innovations in the clocking architecture. In general, there is a minimal difference between global and local clock buffers. Thus, the 7 series regional clock buffers have been replaced by new clock buffers with more global reach while automatically utilizing local clock buffers for local distribution of the clocks. The CMT block consists of one MMCM and two PLLs. The MMCM is very similar to the 7 series family while the PLL has new features for the I/O PHY clocking, but a reduced set of functionality and connectivity with respect to clocking the rest of the device.