NONVOLATILE SEMICONDUCTOR MEMORY

摘要

PROBLEM TO BE SOLVED: To obtain an NROM type memory array of such a structure as adjacent memory units MU share a diffusion bit line interposed between in which generation of a through current path is blocked at the time of reading or writing data simultaneously from or into two memory transistor cells. SOLUTION: Generation of a through current path can be blocked at the time of reading or writing data by dividing an NROM type memory array for each memory block and providing a part for isolating each memory block electrically in the boundary region thereof thereby limiting the number of data being read out or written in simultaneously to only one.