Patent ID: 8451659
Filing Date: 2013-05-28
Classification: G11C

Abstract:
1. A method for driving a nonvolatile semiconductor memory device including a plurality of NAND strings, each of the NAND strings including a plurality of memory cells, each of the memory cells including source/drain diffusion layers spaced from each other in a surface portion of a semiconductor substrate, a laminated insulating film formed on a channel between the source/drain diffusion layers and including a charge storage layer, and a gate electrode formed on the laminated insulating film, the gate electrodes of the memory cells of neighboring NAND strings being connected by a word line, the nonvolatile semiconductor memory device having a first data memory state and a second memory state different from the first memory state, the method comprising: performing a first operation to change to the first data memory state from the second data memory state by injecting electrons into the charge storage layer, the performing the first operation including: