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:
Dec. 06, 2011
Filed:
Feb. 18, 2011
Daniel C Guterman, Fremont, CA (US);
Stephen J Gross, Cupertino, CA (US);
Shahzad Khalid, Union City, CA (US);
Geoffrey S Gongwer, Los Altos, CA (US);
Daniel C Guterman, Fremont, CA (US);
Stephen J Gross, Cupertino, CA (US);
Shahzad Khalid, Union City, CA (US);
Geoffrey S Gongwer, Los Altos, CA (US);
SanDisk Technologies Inc., Plano, TX (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. Read operations are performed on the tracking cells, where threshold voltages of physical states of the tracking cells are further apart than threshold voltages of physical states of non-tracking cells. Based on the read operations, an extent to which the tracking cells are errored is determined.