A system (e.g., a chip) includes first and second function blocks (e.g., function blocks) coupled to an input/output (I/O) device (e.g., a bi-directional pin or pad) via a multiplexing module. The multiplexing module can be used for both input and output of signals between the function blocks and the I/O device. Optionally, a re-clocking system is coupled to the function blocks, the I/O device, and the multiplexing module. The re-clocking system re-clocks one or more signals being input into the multiplexing module so that they are timed correctly for input or output from the system.