Patent ID: 7000156

Claim:
A defect information storing device which stores defect information of a semiconductor device, the semiconductor device having r row redundant circuits, c column redundant circuits, and a semiconductor memory, the defect information storing device comprising: a column-side defect information accumulating table which stores a column address of defective points, and number of the defective points existing at the column address stored, wherein the column-side defect information accumulating table stores the column address and the number of the defective points existing at the column address stored for (r×c+c) lines; and a row-side defect information accumulating table which stores a row address of the defective points, number of the defective points existing at the row address stored, and a column identifier indicating storage place of the column address of the defective points in the column-side defect information accumulating table, wherein the row-side defect information accumulating table stores the row address, the number of the defective points existing at the row address stored, and c column identifiers for (r×c+r) lines.