| 摘要 |
With respect to a memory in which a plurality of backup lines are provided, a backup line assignment device for determining to assign a backup line to any of fail lines comprises a bit counting section for counting, with respect to each fail bit included in each of the fail lines, the number of fail bits of a fail line including the fail bits and in a direction different from that of the fail lines as the number of orthogonal fail bits to store the number of orthogonal fail bits for each of the fail bits, a weight calculating section for calculating the weighting factor of each of the fail lines to store the weighting factor for each of the fail lines on the basis of the number of orthogonal fail bits of each of the fail bits included in each of the fail lines, and an assignment section for determining to assign the backup line to any of the fail lines on the basis of the large and small relation of the weighting factor calculated by the weight calculating section.
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