In one embodiment, a bus multiplexer is between a memory and a functional unit of the integrated circuit. An input of the bus multiplexer couples to a global bus having a bit width. A local bus having a lesser bit width couples to an output of the bus multiplexer. The bus multiplexer selectively multiplexes bits of data on the global bus onto bits of the local bus. In another embodiment, an integrated circuit comprises a memory, a global bus, and a functional unit coupled together. The functional unit includes a bus multiplexer with an input coupled to the global bus, and a local bus coupled to an output of the bus multiplexer. The bus width of the local bus is less than that of the global bus. The bus multiplexer selects data from a subset of bits of the global bus to couple onto the bits of the local bus.