A bit line controller is provided for connecting a data input/output line and one bit line BL to each other. The bit line controller has a data latch for latching multilevel write data supplied from the data input/output line to the memory cell and a sense amplifier for sensing and latching data output...http://www.google.es/patents/US6044013?utm_source=gb-gplus-sharePatente US6044013 - Nonvolatile semiconductor memory device
