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US07643349B2 Efficient erase algorithm for SONOS-type NAND flash 有权
SONOS型NAND闪存的高效擦除算法

Efficient erase algorithm for SONOS-type NAND flash
Abstract:
A method for operating a dielectric charge trapping memory cell as described herein includes applying an initial voltage from the gate to the substrate of the memory cell for a predetermined period of time to reduce the threshold voltage of the memory cell. The method includes applying a sequence of voltages from the gate to the substrate of the memory cell to further reduce the threshold voltage of the memory cell, wherein a subsequent voltage in the sequence of voltages has a lower magnitude from the gate to the substrate than that of a preceding voltage in the sequence of voltages.
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