Patent ID: 9025393
Filing Date: 2015-05-05
Classification: G11C

Abstract:
1. A method for optimizing solid state drive soft retry voltages, comprising: determining a first reference voltage for a first soft retry voltage read, the first reference voltage based on a hard decision read; reading a first soft retry voltage at the first reference voltage; determining if the first soft retry voltage read fails, the determining based on an analysis of the first soft retry voltage read; determining a spacing between the first reference voltage and reference voltages for each one of a plurality of additional soft retry voltage reads, the spacing based on the first soft retry voltage read and a desired bit error rate, the spacing being constant; determining a number of soft retry voltages to be read, the number based on a type of solid state drive; reading a second soft retry voltage from the plurality of additional soft retry voltage reads at a second reference voltage, the second reference voltage at least one iteration of the spacing distant from the first reference voltage; if the first soft retry voltage read fails, then reading the second soft retry voltage at a multiple of iterations of the spacing distant from the first reference voltage, the multiple based on an analysis of a characterization data, the multiple greater than or equal to two; reading each one of the plurality of additional soft retry voltage reads at their respective reference voltages, each of the reference voltages at least one iteration of the spacing distant from a previous reference voltage; and correcting a channel of a memory based on a reading.