Methods of operating a bistable resistance random access memory with multiple memory layers and multilevel memory states
US7586778B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 5, 2008 |
| Grant date | Sep 8, 2009 |
| Priority date | — |
| Expiry date | Jun 5, 2028 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11C2213/77
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A method is described for operating a bistable resistance random access memory having two memory layer stacks that are aligned in series is disclosed. The bistable resistance random access memory comprises two memory layer stacks per memory cell, the bistable resistance random access memory operates in four logic states, a logic “00” state, a logic “01” state, a logic “10” state and a logic “11” state. The relationship between the four different logic states can be represented mathematically by the two variables n and f and a resistance R. The logic “0” state is represented by a mathematical expression (1+f) R. The logic “1” state is represented by a mathematical expression (n+f) R. The logic “2” state is represented by a mathematical expression (1+nf) R. The logic “3” state is represented by a mathematical expression n(1+f) R.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.