SEMICONDUCTOR MEMORY UNIT

摘要

PROBLEM TO BE SOLVED: To provide a semiconductor memory unit which continues to normally operate using the semiconductor memory without exchanging the semiconductor memory even when a defective cell occurs in the semiconductor memory. SOLUTION: The semiconductor memory unit configured to access the semiconductor memory through a memory control circuit includes a section for detecting the defective cell of the semiconductor memory and a defective cell rescue section arranged in the memory control circuit to assign a relief cell to rescue the defective cell of the semiconductor memory based on the result of detection by the defect detecting section. COPYRIGHT: (C)2009,JPO&INPIT