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:
Nov. 29, 1994
Filed:
Nov. 08, 1993
Eliyahou Harari, Los Gatos, CA (US);
Daniel C Guterman, Fremont, CA (US);
Sanjay Mehrotra, Milpitas, CA (US);
Stephen J Gross, Santa Clara, CA (US);
SunDisk Corporation, Santa Clara, CA (US);
Abstract
Various optimizing techniques are used for erasing semiconductor electrically erasable programmable read only memories (EEPROM), An erase algorithm accomplishes erasing of a group of memory cells by application of incremental erase pulses, Techniques include a 2-phase verification process interleaving between pulse applications; special handling of a sample of cells within each erasable unit group; defects handling; adaptive initial erasing voltages; and single- and hybrid-phase algorithms with sector to sector estimation of erase characteristics by table lookup. Techniques are also employed for controlling the uniformity of program/erase cycling of cells in each erasable unit group, Defects handling includes an adaptive data encoding scheme.