| 摘要 |
PURPOSE: To provide the nonvolatile memory whose internal data can not be decoded or copied with ease in consideration of the protection of data stored in the nonvolatile memory such as a mask ROM. CONSTITUTION: The nonvolatile memory is the read-only mask ROM where fixed data are programmed in the mask of an LSI manufacturing process and consists of a memory array 1, an input circuit 2, an address buffer 3, a sense circuit 4, an output circuit 5, a control signal circuit 6, a signal processing circuit 7 which converts a data output in specific process mode, and a data process signal generating circuit 8; and the signal processing circuit 7 is provided between the sense circuit 4 and output circuit 5, and this signal processing circuit 7 inverts or does not invert the output data from the sense circuit 4 according to a combination of a data process control signal generated by the data process signal generating circuit 8 and an address signal inputted to the input circuit 2. |
