Non-volatile memory operations that change a mapping between physical and logical addresses when restoring data
US6754128B2 · kind B2 · utility
3Cited by
65References
10Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Dec 31, 2002 |
| Grant date | Jun 22, 2004 |
| Priority date | — |
| Expiry date | Dec 31, 2022 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11C16/3431
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A multi-bit-per-cell non-volatile memory performs refresh operations that move data to different physical storage locations. The movement of data may extend the life of a non-volatile memory by avoiding repetitive erasing and writing of the same data value in the same memory cell. A memory mapping circuit in the memory adjusts for different storage configuration that the refresh operations create. In a particular embodiment, a refresh operation swaps the physical locations of two data blocks, and alternates between two mappings of physical addresses to logical addresses.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.