| 摘要 |
PURPOSE: To prevent the malfunction of a system device on which a semiconductor memory is mounted by transmitting the reception of invalid address signal to the outside, in a semiconductor memory in which address space is larger than n-th power of 2 and smaller than (n+1)-th power of 2. CONSTITUTION: This memory has plural memory cells, an invalid address detecting circuit, and an invalid signal output circuit. The invalid address detecting circuit detects that an address signal externally supplied does not correspond to address space. The invalid signal output circuit outputs an invalid signal to the outside after detection by the invalid address detecting circuit. Therefore, a system device on which a semiconductor memory is mounted can easily recognize that an invalid address signal is supplied to a semiconductor device. Consequently, the malfunction is prevented, and the reliability of the system device is improved.
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