The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 14, 2009
Filed:
Mar. 16, 2007
Bryan William Hancock, Los Altos, CA (US);
Nicholas H. Tripsas, San Jose, CA (US);
Richard C. Blish, Ii, Saratoga, CA (US);
Bryan William Hancock, Los Altos, CA (US);
Nicholas H. Tripsas, San Jose, CA (US);
Richard C. Blish, II, Saratoga, CA (US);
Advanced Micro Devices, Inc., Austin, TX (US);
Spansion LLC, Sunnyvale, CA (US);
Abstract
One embodiment of the invention relates to a method for refreshing a nonvolatile memory array. In the method, a threshold voltage of a multi-bit memory cell is analyzed to determine if it has drifted outside of a number of allowable voltage windows, wherein each allowable voltage windows corresponds to a different multi-bit value. If the threshold voltage of the cell has drifted outside of the number of allowable voltage states, then the cell is recovered by adjusting at least one voltage boundary of at least one of the number of allowable voltage states.