Data recovery methods in multi-state memory after program fail
US7345928B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Dec 14, 2005 |
| Grant date | Mar 18, 2008 |
| Priority date | — |
| Expiry date | Aug 3, 2026 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11C16/32
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A non-volatile memory device includes the ability to recover data in event of a program failure without having to maintain a copy of the data until the write is completed. As the integrity of the data can thus be maintained with having to save a copy, buffers can be freed up for other data or even eliminated, reducing the amount of controller space that needs to devoted data buffering. In exemplary embodiments, the data is recovered by logically combining the verify data for the (failed) write process maintained in data latches with the results of one or more read operations to reconstitute the data. The exemplary embodiments are for memory cells storing multi-state data, both in the format of independent upper page, lower page form, as well as in 2-bit form. This can be accomplished by a state machine and data latches in the sense amp area on the memory, without use of the controller.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.