| 摘要 |
PURPOSE: A non-volatile semiconductor memory device permitting data-read operation performed during data-write/erase operation is provided to perform a read/erase operation at the same time, and to supply the availability of read-out data to the external device of a semiconductor device. CONSTITUTION: A non-volatile semiconductor memory characterized by comprising: a plurality of memory areas(11, 21); a control unit(33) which performs a data-write or data-erase operation with respect to one of the memory areas(11, 21); an address-detection unit(51) which detects an address that indicates the one of the memory areas(11, 21) having the data-write or data-erase operation performed therein, and supplies information indicative of the address; and at least one output terminal(61,62) which supplies the information to an exterior of the device. The non-volatile semiconductor memory is characterized in that the at least one output terminal(61, 62) is a terminal dedicated for a purpose of outputting the information supplied from the address-detection unit(51). The non-volatile semiconductor memory is characterized by further comprising a selector unit which selects either the information supplied from the address-detection unit(51) or other information, wherein the at least one output terminal(61, 62) supplies the selected information selected by the selector unit to the exterior of the device.
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