Post-facto correction for cross coupling in a flash memory
AssigneeSanDisk IL Ltd.
InventorsIdan Alrod, Eran Sharon
Life of this patent
Estimating the term…
Abstract
A method of storing and reading data, using a memory that includes a plurality of cells (e.g. flash cells), such that data are stored in the cells by setting respective values of a physical parameter of the cells (e.g. threshold voltage) to be indicative of the data, and such that data are read from the cells by measuring those values. One of the cells and its neighbors are read. The data stored in the cell are estimated, based on the measurements and on respective extents to which the neighbors disturb the reading. Preferably, the method also includes determining those respective extents to which the neighbors disturb the reading, for example based on the measurements themselves.
Claims16
A method of storing and reading data, comprising the step of:
- (a) providing a memory that includes a plurality of cells, data being stored in said cells by setting respective values of a physical property of said cells to be indicative of said data, said cells subsequently being read by measuring said respective values to obtain respective measurements of said respective values;
- (b) reading one of said cells and at least one neighbor cell of said one cell, thereby obtaining said respective measurements for said one cell and for each said neighbor cell;
- (c) estimating respective said data that have been stored in said one cell, based on said respective measurements and on a respective extent which each said neighbor cell disturbs said reading of said one cell;
- and
- (d) determining said respective extent to which said each said neighbor cell disturbs said reading of said one cell, wherein said determining is based on a
- nonlinear model of said disturbing.
Non-transitory computer readable media having program instructions for storing and reading data, comprising:
- (a) program instructions for storing data in a memory that includes a plurality of cells by setting respective values of a physical property of said cells to be indicative of said data, said cells subsequently being read by measuring said respective values to obtain respective measurements of said respective values;
- (b) program instructions for reading one of said cells and at least one neighbor cell of said one cell, thereby obtaining said respective measurements for said one cell and for each said neighbor cell;
- (c) program instructions for estimating respective said data that have been stored in said one cell, based on said respective measurements and on a respective extent which each said neighbor cell disturbs said reading of said one cell;
- and
- (d) program instructions for determining said respective extent to which said each said neighbor cell disturbs said reading of said one cell, wherein said determining is based on a nonlinear model of said disturbing.
Dependencies are inferred from the claim text.