SEMICONDUCTOR MEMORY DEVICE HAVING REDUNDANCY DECODER AND A METHOD OF REDUNDANCY TECHNIQUE FOR THE SEMICONDUCTOR MEMORY DEVICE USING REDUNDANCY DECODER

摘要

PURPOSE: A semiconductor memory device is provided which has a redundancy decoder of high efficiency, and a method is provided to remedy a failed cell of a semiconductor memory device using the redundancy decoder. CONSTITUTION: N memory blocks(BLK0-BLKn-1) comprise I columns and J rows for memory cells to form a matrix. N redundancy blocks(R_BLK0-R_BLKn-1) comprises M redundancy rows respectively and correspond each memory block. A block decoder receives x bit column addresses and selects a specific memory block among the memory blocks. A row decoder receives y bit row addresses and selects specific rows. And L redundancy row decoders receive a row address and a column address and select specific redundancy rows. A relation of L,M,N is M L = M*N.