Semiconductor storage apparatus with copy guard function

摘要

For copy guard, an ROM comprises an address data determining circuit, an address sequence monitoring circuit, an error address data generating circuit, and an output selection circuit. The address sequence monitoring circuit monitors the addresses stored in the address data determining circuit and input addresses to determine whether or not the input addresses are in a predetermined sequence of the addresses in the address data determining circuit. The output selection circuit outputs data read from said memory cell array when the address sequence monitoring circuit determines that the address sequence of the input addresses coincides with the predetermined sequence of the addresses stored in the address data determining circuit and outputs error data generated by the error data generating circuit when a determination is made that the sequence of the input addresses does not coincide with the predetermined sequence.