Patent Number: 7,613,056

Title: Semiconductor memory device

Abstract: In a semiconductor memory device provided with a redundancy circuit for conducting a repair of defective memory cells, the memory cell defects which are unevenly distributed can be efficiently repaired. The semiconductor memory device has a plurality of memory blocks, and the memory block includes a plurality of segments. A redundancy memory block which substitutes for defective data of a segment is physically provided to each of the plurality of memory blocks. A block address of the redundancy memory block is logically allocated to the plurality of memory blocks in common.

Inventors: Ogawa; Sumio (Hiroshima, JP), Koshikawa; Yasuji (Tokyo, JP)

Assignee: Elpida Memory, Inc.

International Classification: G11C 29/00 (20060101)

Expiration Date: 1/03/02017