Macronix International Co., Ltd.

Wen-Wei Yeh

Kuo-Pin Chang

Hang-Ting Lue

Chih-Shen Chang

A method is provided for operating a NAND array that includes a plurality of blocks of memory cells. A block of memory cells includes a plurality of NAND strings having channel lines between first string select switches and second string select switches. The plurality of NAND strings shares a set of word lines between the first and second string select switches. A channel-side erase voltage is applied to the channel lines through the first string select switches in a selected block. Word line-side erase voltages are applied to a selected subset of the set of word lines in the selected block to induce tunneling in memory cells coupled to the selected subset. Word line-side inhibit voltages are applied to an unselected subset of the set of word lines in the selected block to inhibit tunneling in memory cells coupled to the unselected subset.

Forced-bias method in sub-block erase

A pre-reading method and a programming method for a 3D NAND flash memory are provided. The pre-reading method comprises the following steps. A selected string includes a first memory cell, two second memory cells and a plurality of third memory cells. The two second memory cells are adjacent to the first memory cell. The third memory cells are not adjacent to the first memory cell. A first pass voltage is applied on the second memory cells, a second pass voltage is applied on the third memory cells, and a read voltage is applied on the first memory cell via a plurality of word lines for reading a data of the first memory cell. The first pass voltage is larger than the second pass voltage.

Pre-reading method and programming method for 3D NAND flash memory

A memory device is described that includes a three-dimensional array of memory cells having a plurality of levels of memory cells accessed by a plurality of word lines, and a plurality of bit lines. Control circuitry is coupled to the plurality of word lines and the plurality of bit lines. The control circuitry is adapted for programming a selected memory cell in a selected level of the array and on a selected word line, by hot carrier generation assisted FN tunneling, while inhibiting disturb in unselected memory cells in unselected levels and in the selected level and on unselected word lines by self-boosting.

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Bade, Taiwan

Wen-Wei Yeh