A 1.8-V 256-Mb Multilevel Cell NOR Flash Memory With BGO Function. - Taku Ogura; Masahiro Hosoda; Tomoya Ogawa; Tamiyu Kato; Akihiko Kanda; Tomoyuki Fujisawa; Satoshi Shimizu; Masafumi Katsumata (IEEE J. Solid State Circuits, 2006)