| 摘要 |
A write-once memory can be written only once to each memory cell; therefore, a defective bit cannot be detected by an actual inspection of writing. Accordingly, as described above, the measures, in which a redundant circuit is provided and the defective bit is modified before shipping, cannot be taken; thus, it is difficult to provide a memory with few defects. The purpose of the present invention is to provide a write-once memory where the probability of a defect is reduced considerably. A nonvolatile memory that can be written only once includes a redundant memory cell, a first circuit which allocates an address to the redundant memory cell, a second circuit which outputs a determination signal indicative of whether writing is performed normally, and a third circuit to which the determination signal is inputted and which controls the first circuit and the second circuit. [Reference numerals] (AA) Determination signal |
