| 摘要 |
PROBLEM TO BE SOLVED: To detect word line multiple selection caused by a defective program Raving a defective address. SOLUTION: Address allotment for spare sub-word lines (SSWL0-SSWL3) is made to differ from address allotment of normal sub-word lines (NSWL 0-NSWL3) by a spare address conversion circuit (14) at write or at read. Data is written so that a reversed data pattern is stored in a spare word line before address conversion and after address conversion. At occurrence of multi- selection, as confliction of data is caused in a correspondent bit line, multi- selection can surely be detected. COPYRIGHT: (C)2003,JPO
|
