NONVOLATILE SEMICONDUCTOR MEMORY

摘要

PROBLEM TO BE SOLVED: To provide a nonvolatile semiconductor memory which can practice a stable operation and a high speed access operation. SOLUTION: A timing generating means 51 which generates a timing signal by which a memory core unit 4 is made to practice an access operation uses 1st and 2nd clocks whose periods are identical and whose phases are different. The 1st clock which has an advanced phase than the 2nd clock is used in order to generate a timing signal for processing at least one event in the first half of a plurality of read access events and the 2nd clock is used in order to generate a timing signal for processing remaining events.