| 摘要 |
PROBLEM TO BE SOLVED: To suppress the time delay between a normal operation and a referring operation without separate input-output lines and a sense amplifier by simultaneously enabling the normal column line of a selected column segment and the spare column line of other column segment corresponding to the selected column segment when a defect is generated in the selected colum segment. SOLUTION: In a defect generation in a column segment 0:10, the normal column line cyi of this segment and the spare column line syi of a column segment 1:20 are simultaneously enabled. That is, in the defect generation in the segment 0:10, a redundancy operation with respect to the address in which the defect is generated is performed by cutting a fuse being in the fuse box 24 of the column segment 1:20. Thus, since the referring information of the fuse box 24 is not received by a normal Y-decoder 22, a column enable operating speed is not only fast but also a complete referring operation is performed at a referring time without a separated additional circuit.
|
