Patent ID: 7359249

Claim:
A nonvolatile semiconductor memory device, comprising: a memory cell array having a plurality of memory cells; and a writing controller for writing data to said memory cell array, wherein said memory cell array stores data in a nonvolatile state with respect to each memory cell pair composed of two memory cells, the data storing being executed based on a difference in memory information between said two memory cells, said writing controller is capable of individually setting said memory information for each of said memory cells of said memory cell array, and said nonvolatile semiconductor memory device further comprises an amplification circuit for amplifying the difference in information stored in two memory cells, wherein said writing controller executes writing data of the same value to plural pairs of said memory cell pairs, and said nonvolatile semiconductor memory device further comprises a decision element, wherein said decision element obtains a majority logic based on outputs from said amplification circuit provided to said plural pairs of said memory cell pairs, thereby to decide the data written to said plural pairs of said memory cell pairs for outputting.