Semiconductor memory preventing unauthorized copying
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United States of America Patent
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Feb 7, 2006
Issued Date -
N/A
app pub date -
Jun 23, 2004
filing date -
Jun 25, 2003
priority date (Note) -
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Abstract
A memory mat is provided separately from a memory mat that is a normal memory area, and data therein cannot be read from the outside. In a page buffer, information input from the outside is stored. A comparing circuit compares security information stored in memory mat with information stored in page buffer, and the comparison result is output to the outside as a status. Even when unauthorized copying is performed, information in memory mat is not copied. Therefore, an external apparatus can easily determine whether or not the semiconductor memory is an unauthorized copy by referring to the status.
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