BUFGMUX

BUFGMUX is a family of clock multiplexer primitives found in Xilinx Field Programmable Gate Arrays (FPGAs). These primitives are designed to select one of multiple clock inputs and route it to a single clock output. This is a crucial component for managing clock distribution within complex FPGA designs, enabling efficient and reliable clocking schemes. BUFGMUX instances are typically used to switch between different clock sources, such as a primary system clock, a secondary clock, or a generated clock from a Phase-Locked Loop (PLL) or Digital Clock Manager (DCM). The selection is usually controlled by configuration signals. By providing a dedicated hardware resource for clock multiplexing, BUFGMUX primitives help to reduce routing congestion and improve timing performance compared to implementing multiplexing logic using general-purpose fabric. They are part of the fundamental building blocks available to designers when creating clock networks in Xilinx devices. The specific number and types of clock inputs and configuration options can vary depending on the particular FPGA family and device.