Semiconductor memory device

摘要

A semiconductor memory device including a write protect information element for storing write permit information or write protect information for a word line or a bit line, and a write protect detection element for outputting a write permit or protect signal to a write circuit in accordance with the information stored in the write protect information element for the word line or bit line selected by a row decoder or a column decoder. When the write circuit receives a write protect signal output from the write protect detection means in the case that the write protect information means stores write protect information, the write circuit does not output a data signal.