A flash memory has been described that can be coupled to an SDRAM controller that performs address scrambling. The illumination optical system includes a polarization controller, a coherence reducer and an objective lens for illuminating a specimen with a polarization condition controlled and coherency reduced ultraviolet laser beam through the objective lens. An angled wall is disposed between and connected to the first wall and the second wall to support the second wall away from the first wall. The multiplexer transmits the write address signal and the read address signal to the static random access memory, and generates the write command and the read command. The metal cap films 30 are provided only on the interconnects 10 and not provided on the electric fuse 20.