A method of forming a piezoelectronic transistor device, the PET device, and a semiconductor including the PET device are described. The apparatus comprises power conversion means for converting power transmitted from the wave to the arms into electric power, e. The rebar has ribs; the ribs’ height is between 0. In this way a generic self-test controller may be provided that is able to drive tests within multiple different memory devices by providing a relatively simple mapping circuit.