Patent 9741431 was granted and assigned to Sk Hynix Memory Solutions Inc. on August, 2017 by the United States Patent and Trademark Office.
An optimal read threshold estimation method includes determining a flip difference corresponding to an optimal step size Δopt, estimating a first slope m1 at a first read point and a second slope m2 at a second read point, and obtaining an optimal read threshold (XLPopt) as the intersection of a first line with the first slope m1 and a second line with the second slope m2.