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:
Sep. 11, 2018
Filed:
Oct. 28, 2016
Applicant:
Sandisk Technologies Llc, Plano, TX (US);
Inventors:
Biswajit Ray, Mountain View, CA (US);
Mohan Dunga, Santa Clara, CA (US);
Changyuan Chen, San Ramon, CA (US);
Assignee:
SanDisk Technologies LLC, Addison, TX (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G11C 16/34 (2006.01); G11C 16/10 (2006.01); G11C 16/28 (2006.01); G11C 16/04 (2006.01); G11C 16/16 (2006.01);
U.S. Cl.
CPC ...
G11C 16/3431 (2013.01); G11C 16/0483 (2013.01); G11C 16/10 (2013.01); G11C 16/16 (2013.01); G11C 16/28 (2013.01); G11C 16/3495 (2013.01);
Abstract
An erase operation includes one or more erase depth checks to detect the occurrence of shallow erased memory cells at the end of an erase process. Memory cells are subjected to erase and erase verification until erase verification success is achieved. At the end of successful erase verification, a subset of memory cells is read to detect an erase depth or level of the memory cells. If the erase depth check indicates that the subset memory cells are in a shallow erased condition, additional erasing and verification is performed.