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:
Mar. 29, 2011
Filed:
Apr. 20, 2010
Daniel C. Guterman, Fremont, CA (US);
Stephen J. Gross, Cupertino, CA (US);
Shazad Khalid, Union City, CA (US);
Geoffrey S. Gongwer, Los Altos, CA (US);
Daniel C. Guterman, Fremont, CA (US);
Stephen J. Gross, Cupertino, CA (US);
Shazad Khalid, Union City, CA (US);
Geoffrey S. Gongwer, Los Altos, CA (US);
SanDisk Corporation, Milpitas, CA (US);
Abstract
Tracking cells are used in a memory system to improve the read process. The tracking cells can provide an indication of the quality of the data and can be used as part of a data recovery operation if there is an error. The tracking cells provide a means to adjust the read parameters to optimum levels in order to reflect the current conditions of the memory system. Additionally, some memory systems that use multi-state memory cells will apply rotation data schemes to minimize wear. The rotation scheme can be encoded in the tracking cells based on the states of multiple tracking cells, which is decoded upon reading.