Rice Software Consulting
Crossbar is the most efficient architecture to organize memory devices into dense, large-scale arrays. Emerging nanotechnology promises two-terminal, symmetric memory devices of superior electrical properties. In this paper, however, the authors show that these two-terminal, symmetric devices impose grave challenges to the crossbar-based memory organization. They prove that conventional crossbar organization will not work for such symmetric devices. They proposed a revised crossbar organization that does work for such devices. However, diodes or switches must be employed to convert such devices into asymmetrical devices in order to avoid considerable energy cost, which can significantly discount their advantage over conventional asymmetrical devices.