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:
May. 22, 2018
Filed:
Nov. 17, 2014
Sandisk Technologies Llc, Plano, TX (US);
Anubhav Khandelwal, Mountain View, CA (US);
Dana Lee, Saratoga, CA (US);
Abhijeet Manohar, Karnataka, IN;
Henry Chin, Fremont, CA (US);
Gautam Dusija, Milipitas, CA (US);
Daniel Tuers, Kapaa, HI (US);
Chris Avila, Saratoga, CA (US);
Cynthia Hsu, Fremont, CA (US);
SanDisk Technologies LLC, Plano, TX (US);
Abstract
Techniques are presented to reduce the amount of read disturb on partially written blocks of NAND type non-volatile memory, both for when determining the last written word line in a block and also for data read. In both cases, non-selected word lines that are unwritten or, in the case of finding the last written word line, may be unwritten are biased with a lower read-pass voltage then is typically used. The result of such reads can also be applied to an algorithm for finding the last written word by skipping a varying number of word lines. Performance in a last written page determination can also be improved by use of shorter bit line settling times than for a standard read.