JPS6430100A - Semiconductor memory device - Google Patents

Abstract

PURPOSE:To improve the practical yield of a semiconductor memory element having X1 bit constitution by selectively using only a unit cell array consisting of only sound cells and including no defective cell to utilize the element including defective cells. CONSTITUTION:When a selecting circuit 20 is connected between a memory bank MB and an address bus AB and one bit of high-order bits in a row address specifying a unit cell array 11 is fixed, the semiconductor memory element 10 in the memory bank MB is enabled to access only a half of plural unit cell array 11 and disabled from accessing the other half. When the unit cell arrays to be accessed consist of only sound cells and are the semiconductor memory elements 10 including no defective cell, the element can be effectively utilized in the memory bank MB through the memory capacity is reduced into a half of the ordinary one. Consequently, the practical yield of the element can be improved.