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:
Apr. 29, 2014
Filed:
Apr. 26, 2012
Chris Nga Yee Avila, Saratoga, CA (US);
Jianmin Huang, Sunnyvale, CA (US);
Lee M. Gavens, Milpitas, CA (US);
Idan Alrod, Herzliya, IL;
Chris Nga Yee Avila, Saratoga, CA (US);
Jianmin Huang, Sunnyvale, CA (US);
Lee M. Gavens, Milpitas, CA (US);
Idan Alrod, Herzliya, IL;
Sandisk Technologies, Inc., Plano, TX (US);
Abstract
A non-volatile memory chip having SLC blocks acting as a write cache for MLC blocks for high density storage requires constant copying or folding of SLC blocks into MLC blocks. To avoid the time-consuming toggling out and in of the pages of the entire SLC block for ECC checking by a controller chip, only a small sample is checked. An optimal read point for reading the memory cells in the sample of the SLC block is dynamically determined by trying different read points so that the data is read within an error budget. Once the optimal read point is determined, it is used to read the entire SLC block without further error checking. Then the SLC block can be copied (blind folded) to the MLC block with the confidence of being within the error budget.