A programmable and configurable datapath unit (DPU) includes a configuration of single-bit multi-function processing units (PUs). The DPU can perform any of a variety of functions depending on the control applied to each PU. Functionality can be increased by utilizing multiplexers to direct data into, out of, and through each DPU dependent on the selected function being performed. Datapath units can also be configured and interconnected to form larger datapath circuits, arrays, and systems so as to increase the data throughput of the datapath system. A configurable and programmable datapath array includes rows of datapath units which can be interconnected to provide DPU circuits having varying input operand widths and functions. A datapath system can be constructed with a plurality of arrays of DPUs to further increase system data throughput.