NONVOLATILE SEMICONDUCTOR STORAGE DEVICE AND NONVOLATILE MEMORY SYSTEM USING THE SAME

摘要

PROBLEM TO BE SOLVED: To provide a nonvolatile semiconductor storage device which automatically adjusts an initial writing voltage for each word line and a nonvolatile memory system using the same.

SOLUTION: The nonvolatile semiconductor storage device 1 includes a ROM fuse 11 and an adjustment circuit for obtaining a parameter of the initial writing voltage adjusted for each word line. The adjustment circuit is configured by a part of a control circuit 17. The ROM fuse 11 includes a region for storing a parameter of the adjusted initial writing voltage for each word line. The control circuit 17 writes data to a memory cell array 24 on the basis of information stored in the ROM fuse 11 and a data register 22.

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