| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a non-volatile semiconductor storage device capable of storing data, which require security, like an identification number peculiar for a chip. SOLUTION: This device has information showing the number of times of erasure in an erasure unit area among partial or all storage areas in the managing information area of the erasure unit area, and when the information is of a prescribed value, a voltage required for erasure is not applied to word lines, data lines or source lines in partial or all areas as mentioned above by an operation controller inside the chip. Besides, similar control is performed concerning write as well.</p> |
