Patent ID: 11972819
Assignee: SANDISK TECHNOLOGIES, INC.
Field: Computer technology (Electrical engineering)
Classification: CPC G | IPC G

Claim 19:
20. A non-volatile storage apparatus, comprising:
a plurality of non-volatile memory cells arranged as NAND strings to form a block having three sub-blocks, each NAND string includes memory cells in each of the three sub-blocks;
a plurality of word lines connected to the NAND strings;
a plurality of bit lines connected to the NAND strings;
one or more source lines connected to the NAND strings; and
means, connected to the word lines and bit lines as well as the one or more source lines, for programming memory cells connected to a selected word line by applying a series of program voltage pulses to the selected word line and performing program-verify between the program voltage pulses, the means for programming concludes program-verify by:
concurrently lowering a voltage applied to a selected word line from a verify voltage to ground and lowering voltages applied to word lines on a first side of the selected word line from one or more overdrive voltages to ground at a conclusion of program-verify between the program voltage pulses and prior to a next program voltage pulse, and
subsequent to lowering the voltage applied to the selected word line, successively lowering voltages applied to groups of one or more word lines on a second side of the selected word line from one or more overdrive voltages to ground at the conclusion of the program-verify between the program voltage pulses beginning with a group of one or more word lines immediately adjacent the selected word line and progressing to other groups of one or more word lines disposed increasingly remote from the selected word line.