Method and system for adaptively finding reference voltages for reading data from a MLC flash memory
US7848152B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | May 12, 2009 |
| Grant date | Dec 7, 2010 |
| Priority date | — |
| Expiry date | Jul 9, 2029 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11C2211/5634
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A method and system for adaptively finding reference voltages for reading data from a multi-level cell (MLC) flash memory is disclosed. According to one embodiment, information about an initial threshold voltage distribution is firstly provided. A first threshold voltage in the initial threshold voltage distribution is then associated with a second threshold voltage in a shifted threshold voltage distribution to be determined, such that the information corresponding to the first threshold voltage is approximate to the information corresponding to the second threshold voltage. Accordingly, initial reference voltage or voltages of the initial threshold voltage distribution are shifted with an amount approximate to difference between the first threshold voltage and the second threshold voltage, thereby resulting in new reference voltage or voltages for reading the data from the MLC flash memory.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.