| 摘要 |
A spare sector is in a blank state beforehand. Each time the erasing is carried out in practical use, the number of erase pulses is counted or the presence/absence of overcurrent flowing when the erase pulse is being applied is monitored. A regular sector having long-erase failure thus detected is automatically replaced with a spare sector. In this manner, the long-erase failure can be recovered without erasing the spare sector after automatic redundancy with the spare sector.
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