PROGRAMMABLE LOGIC ELEMENT AND DATA REWRITING SYSTEM FOR PROGRAMMABLE LOGIC ELEMENT

摘要

PROBLEM TO BE SOLVED: To provide a programmable logic element which can have its program rewritten with ease, hold secrecy, and easily specify decoding key data used to decode the programmable logic element and a system for rewriting the data of a programmable logic element like this way. SOLUTION: The programmable logic element A is equipped with a decoding circuit 2, a programmable logic circuit 4, a decoding key data writing circuit 6, and a decoding key storage circuit 7 which uses a nonvolatile storage circuit.