Sharp Kabushiki Kaisha Corporation

Yoshiaki Tabuchi

Yoshiji Ohta

Kazuya Ishihara

Nobuyoshi Awaya

The present invention provides a nonvolatile semiconductor memory device that can optimize a timing of performing an error detection and correction process to shorten a processing time. Upon receiving a write request to a memory cell array including a variable resistive element where information is stored based on a resistance state of a variable resistor, an input/output buffer outputs write data to a write control unit and an ECC control unit. The write control unit performs a data write process of writing divided data, obtained by dividing the write data into a predetermined number of data, to the databanks. The ECC control unit generates a first error correction code by performing an error correction code generation process to the write data or the divided data, in parallel with the data write process. The write control unit performs a code write process of writing first test data into an ECC bank.

Nonvolatile semiconductor memory device

A three-dimensional memory cell array of memory cells with two terminals having a variable resistive element is formed such that: one ends of memory cells adjacent in Z direction are connected to one of middle selection lines extending in Z direction aligned in X and Y directions; the other ends of the memory cells located at the same point in Z direction are connected to one of third selection lines aligned in Z direction; a two-dimensional array where selection transistors are aligned in X and Y directions is adjacent to the memory cell array in Z direction; gates of selection transistors adjacent in X direction, drains of selection transistors adjacent in Y direction and sources of selection transistors are connected to same first selection line, second selection line, and different middle selection lines, respectively; and first, second and third selection lines are connected to X, Y and Z decoders, respectively.

Growing community of inventors

Osaka, Japan

Yoshiaki Tabuchi