Method of programming a 3-dimensional nonvolatile memory device based on a program order of a selected page and a location of a string selection line
View Patent ↗A nonvolatile memory device comprises cell strings formed in a direction substantially perpendicular to a substrate and is configured to select memory cells in units corresponding to a string selection line. The device selects a page to be programmed among pages sharing a common word line, determines a level of a program voltage to be provided to the selected page according to a location of a string selection line corresponding to the selected page, and writes data in the selected page using the determined level of the program voltage.
1. A method of operating a nonvolatile memory device comprising cell strings formed in a direction substantially perpendicular to a substrate and configured to select memory cells in units corresponding to a string selection line, the method comprising:
selecting a page to be programmed among pages sharing a common word line;
determining a level of a program voltage to be provided to the selected page according to a location of the string selection line corresponding to the selected page; and
writing data in the selected page using the determined level of the program voltage.
2. The method of claim 1 , wherein determining the level of the program voltage to be provided to the selected page comprises:
comparing the location of the string selection line of the selected page with a location of a reference string selection line; and
determining a level of the program voltage to be provided to the selected page by determining whether the selected page is programmed in a first part of a reference order.
3. The method of claim 2 , wherein determining whether the selected page is programmed in the first part of the reference order comprises determining whether the location of the string selection line of the selected page precedes the location of the reference string selection line.
4. The method of claim 3 , wherein where the selected page is programmed in the first part of the reference order, an increment of a program voltage to be provided to a word line corresponding to the selected page is set to be lower than an increment of a predetermined program voltage.
5. The method of claim 4 , wherein where the selected page is programmed in the first part of the reference order, a level of a pass voltage to be provided to an unselected word line is set to be lower than a level of a predetermined pass voltage.
6. The method of claim 4 , wherein where the selected page is programmed in the first part of the reference order, a level of a start program voltage among program voltages to be provided to the selected word line is set to be higher than a level of a predetermined start program voltage.
7. The method of claim 3 , wherein where the selected page is programmed after the first part of the reference order, a level of a verification read voltage to be provided to the selected word line is set to be higher than a level of a predetermined verification read voltage.