An apparatus has magnetic logic units a logic circuit configured to receive a serial input bit stream at an input node. Individual bits of data from the serial input bit stream are serially written into individual magnetic logic units without buffering the serial input bit stream between the input node and the individual magnetic logic units. Individual bits of data from individual magnetic logic units are serially read to produce a serial output bit stream on an output node without buffering the serial output bit stream between the individual magnetic logic units and the output node.