发明授权
US09070474B2 Nonvolatile semiconductor memory device 有权
非易失性半导体存储器件

Nonvolatile semiconductor memory device
摘要:
An erase verify operation is executed divided into at least a first erase verify operation and a second erase verify operation. The first erase verify operation is an operation that applies a verify read voltage only to a first group of memory cells among the plurality of memory cells included in the NAND cell unit, and applies a first read pass voltage to memory cells other than the first group of memory cells. The second erase verify operation is an operation that applies the verify read voltage to a second group of memory cells different from the first group of memory cells, and applies a second read pass voltage different from the first read pass voltage to memory cells other than the second group of memory cells.
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