Adaptive dynamic reading of flash memories

Details Adaptive dynamic reading of flash memories Adaptive dynamic reading of flash memories

2011-01-25

2011-01-25

Lam, David (Department: 2827)

Static information storage and retrieval

Floating gate

Particular biasing

C365S185030, C365S185210, C365S185200

Reexamination Certificate

active

07876621

ABSTRACT:
Each of a plurality of flash memory cells is programmed to a respective one of L≧2 threshold voltage states within a threshold voltage window. A histogram is constructed by determining how many of some or all of the cells have threshold voltages in each of two or more of m≧2 threshold voltage intervals within the threshold voltage window. Reference voltages for reading the cells are selected based on estimated values of shape parameters of the histogram. Alternatively, the cells are read relative to reference voltages that define m≧2 threshold voltage intervals that span the threshold voltage window, to determine numbers of at least a portion of the cells whose threshold voltages are in each of two or more of the threshold voltage intervals. Respective threshold voltage states are assigned to the cells based on the numbers without re-reading the cells.

REFERENCES:
patent: 5657332 (1997-08-01), Auclair et al.
patent: 6269023 (2001-07-01), Derhacobian et al.
patent: 6522580 (2003-02-01), Chen et al.
patent: 6751766 (2004-06-01), Guterman et al.
patent: 2007/0091677 (2007-04-01), Lasser et al.
patent: 2008/0077841 (2008-03-01), Gonzalez et al.
patent: 2008/0077842 (2008-03-01), Gonzalez et al.
patent: 2008/0263265 (2008-10-01), Litsyn et al.
patent: WO2008/111058 (2008-09-01), None
A .P .Dempster, N .M .Laird and D .B .Rubin,, Maximum likelihood from incomplete data via the EM algorithm:, Journal of the Royal Statistical Society, vol. 39 No. 1 pp. 1-39 (1977).
U.S. Appl. No. 11/808,906, filed Jun. 2008, Eran Sharon et al.
Restriction Requirement dated Apr. 5, 2010, and Response filed Apr. 13, 2010 in U.S. Appl. No. 11/941,945.
U.S. Appl. No. 11/808,906, filed Jun. 2008, Eran Sharon et al.
A .P . Dempster, N .M .Laird and D .B .Rubin, Maximum likelihood from incomplete data via the EM algorithm:, Journal of the Royal Statistical Society, vol. 39 No. 1 pp. 1-39 (1977).
Office Action isseued Jun. 4, 2010 in U.S. Appl. No. 11/941,945.
International Search Report and Written Opinion of the International Searching Authority dated Sep. 3, 2008 for International Applicational No. PCT/IL2008/000507, 11 pages.

Affiliated with

Also associated with

Rating

Adaptive dynamic reading of flash memories does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Adaptive dynamic reading of flash memories, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Adaptive dynamic reading of flash memories will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2678231