Optimized threshold search in analog memory cells using separator pages of the same type as read pages
US8830746B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 30, 2013 |
| Grant date | Sep 9, 2014 |
| Priority date | — |
| Expiry date | May 30, 2033 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11C29/028
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A method includes reading a group of analog memory cells using first explicit read thresholds, to produce first readout results. The group is re-read using second explicit read thresholds, to produce second readout results. The group is read using one or more sets of auxiliary thresholds so as to produce auxiliary readout results, such that the number of the auxiliary thresholds in each set is the same as the number of the first explicit read thresholds and the same as the number of the second explicit read thresholds. A readout performance of third read thresholds, which include at least one of the first explicit read thresholds and at least one of the second explicit read thresholds, is evaluated using the first, second and auxiliary readout results.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.