Patent ID: 8254192
Filing Date: 2012-08-28
Classification: G11C

Abstract:
1. A resistance change memory comprising: a memory cell array in which a plurality of memory cells including resistance change memory element are arranged in a matrix manner; a plurality of word lines connected to the plurality of memory cells, respectively, and extending in a first direction; a row decoder which is disposed near the memory cell array and which activates each of the word lines; a redundant cell array in which a plurality of redundant cells used instead of defective cells in the memory cell array are arranged; a redundant word line connected to the plurality of redundant cells, respectively, and extending in the first direction; a redundant row decoder which is disposed near the redundant cell array and which activates the redundant word line; a control circuit in which defect address information indicating the word line connected to the defective cell is stored and which remedies the defective cell in a case where input address information matches the defect address information; and at least two regions provided in the memory cell array and the redundant cell array, respectively, logically divided in the first direction, and identified based on column address information; at least one defect address storage section in the control circuit, which stores the defect address information, the one defect address storage section having two or more storage elements in which the defect address information is stored and which are provided in accordance with the two or more regions, respectively, and having a switch element which is provided in accordance with each of the two or more storage elements and which selectively reads one piece of the defect address information from one of the two or more storage elements based on the column address information, wherein the control circuit replaces a part of the word line connected to the defective cell with a part of the redundant word line in accordance with each of the logically divided regions, and allows the redundant row decoder to activate the replaced redundant word line.