| 摘要 |
PURPOSE:To realize a storage device which is free from defect as a whole, by providing a single or plural spare storage elements plus defect existence indicating memories. CONSTITUTION:A single or plural spare storage elements SO-Sm plus defect existence indicating memories FO-Fm are designated by a part of an address that designates the position of a defective bit within the address of elements of MOO -Mnm plus the chip selection address information. The contents of the memories FO-Fm are read in the same cycle and according to the start of operation of a storage device. Based on these contents, the read/write action is carried out to the elements MOO-Mnm is case the designated address group has no defect and to the elements SO-Sm in case the address group has a defect respectively. |
