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:
Jun. 02, 2015
Filed:
Mar. 01, 2013
Sandisk Technologies Inc., Plano, TX (US);
Jianmin Huang, San Carlos, CA (US);
Zhenming Zhou, San Jose, CA (US);
Gautam Ashok Dusija, Milpitas, CA (US);
Chris Nga Yee Avila, Saratoga, CA (US);
Dana Lee, Saratoga, CA (US);
SanDisk Technologies Inc., Plano, TX (US);
Abstract
A method of determining whether a page of NAND flash memory cells is in an erased condition includes applying a first set of read conditions to identify a first number of cells having threshold voltages above a discrimination voltage under the first set of read conditions, if the first number of cells is less than a first predetermined number, applying a second set of read conditions that is different from the first set of read conditions to identify a second number of cells having threshold voltages above the discrimination voltage under the second set of read conditions, and if the second number of cells exceeds a second predetermined number, marking the page of flash memory cells as partially programmed.