Patent ID: 9704596
Date: 2017-07-11
CPC Classifications: G06F,G11C

Claim:
1. A method of operating a non-volatile memory device, including a plurality of cell strings, each of the cell strings including a plurality of memory cells, the method comprising: supplying an erase voltage to the memory cells of each of the cell strings; performing a first read operation by applying a first verify voltage to even word-lines connected to the memory cells of each of the cell strings and applying a high voltage to odd word-lines connected to the memory cells of each of the cell strings; performing a second read operation by applying the first verify voltage to the odd word-lines connected to the memory cells of each of the cell strings and applying the high voltage to the even word-lines connected to the memory cells of each of the cell strings; and performing a first erase verify operation by performing a first exclusive-or (XOR) operation on a result of the first read operation and a result of the second read operation.