Patent ID: 6373759
Filing Date: 2002-04-16
Classification: G11C

Abstract:
An SRAM device comprising:a plurality of normal memory blocks each including N normal memory cells for storing data, wherein N is a natural number; a spare memory block including one or more spare memory cells for storing data; a defective block setting section for storing first defective block information indicating a normal memory block including a defective normal memory cell among the plurality of normal memory blocks; N internal data lines which are respectively coupled to the N normal memory cells included in each of the plurality of normal memory blocks, where the N internal data lines are used for reading data stored in the N normal memory cells included in one of the plurality of normal memory blocks which is designated by access information, wherein the access information is externally input to the SRAM device; one or more spare data lines coupled to the spare memory block for reading data from the one or more spare memory cells included in the spare memory block; N external data lines via which the SRAM device outputs the data; and a coupling circuit for, depending on whether or not the first defective block information matches the access information, either coupling those of the N internal data lines which are not coupled to a defective normal memory cell in the normal memory block indicated by the first defective block information and at least one of the one or more spare data lines to the N external data lines, or coupling the N internal data lines to the N external data lines.