NAND flash memory and blank page search method therefor
First Claim
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1. A blank page search method for a semiconductor memory device, comprising:
- setting a selection word line voltage to a first level and detecting at once whether all data in two pages are in an erase state; and
when it is detected at once that not all the data are in the erase state, setting the selection word line voltage to a second level and detecting at once whether all data in one of the two pages are in the erase state.
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Abstract
A semiconductor memory device includes a memory cell array, data buffer, and column switch. The data buffer senses the potential of a bit line to determine data in a selected memory cell and hold readout data in a read. The data buffer detects both whether the whole data buffer holds “0” data and whether the whole data buffer holds “1” data. The column switch selects part of the data buffer and connects the part to a bus.
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Citations
5 Claims
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1. A blank page search method for a semiconductor memory device, comprising:
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setting a selection word line voltage to a first level and detecting at once whether all data in two pages are in an erase state; and when it is detected at once that not all the data are in the erase state, setting the selection word line voltage to a second level and detecting at once whether all data in one of the two pages are in the erase state. - View Dependent Claims (2, 3, 4, 5)
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Specification