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. 27, 2011
Filed:
Mar. 30, 2009
Fumitoshi Ito, Yokohama, JP;
Shinji Sato, Chigasaki, JP;
Fumitoshi Ito, Yokohama, JP;
Shinji Sato, Chigasaki, JP;
SanDisk Technologies Inc., Plano, TX (US);
Abstract
Techniques are disclosed herein for applying different process steps to single-level cell (SLC) blocks in a memory array than to multi-level cell (MLC) blocks such that the SLC blocks will have high endurance and the MLC blocks will have high reliability. In some aspects, different doping is used in the MLC blocks than the SLC blocks. In some aspects, different isolation is used in the MLC blocks than the SLC blocks. Techniques are disclosed that apply different read parameters depending on how many times a block has been programmed/erased. Therefore, blocks that have been cycled many times are read using different parameters than blocks that have been cycled fewer times.