Multi bit program algorithm
US7038950B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 5, 2004 |
| Grant date | May 2, 2006 |
| Priority date | — |
| Expiry date | Nov 5, 2024 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11C2211/5621
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
Methods of programming NEW data into unprogrammed bits of a group of memory cells is provided. The method applies an interactive programming algorithm that individually verifies and programs the NEW data, reference (REF) data, and existing or OLD data. OLD data is separately verified to a compensated program verify level from that of the NEW data to improve memory reliability and insure minimal uniform stress levels to the array. The improved programming algorithm prevents older data from being needlessly refreshed, thus mitigating stress to the cells that eventually causes the data areas to decay at different rates and become prematurely unreliable.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.