Multi-level programming allows for writing a first and a second bit in selected cells by separately programming the first bit from the second bit. Programming of the first bit determines a shifting from a first threshold level to a second threshold level. Programming of the second bit requires a preliminary...http://www.google.de/patents/US7382660?utm_source=gb-gplus-sharePatent US7382660 - Method for accessing a multilevel nonvolatile memory device of the flash NAND type
