Nonvolatile storage device and self-redundancy method for the same
US7355908B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 11, 2003 |
| Grant date | Apr 8, 2008 |
| Priority date | — |
| Expiry date | Jan 2, 2025 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11C16/344
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
The nonvolatile storage device is made up of a memory array divided into a plurality of data-storage units and a plurality of redundancy-storage units for replacing respective failed data-storage units. A control unit detects the functionality of the data-storage units and, in case of failure, enables a redundancy-detection unit having a plurality of volatile-memory elements connected through a sequential daisy-chain connection. A nonvolatile memory unit stores, in a nonvolatile way, the redundancy information through a data bus, connected both to the redundancy-detection unit and to the nonvolatile memory unit; in the event of failure, the redundancy-detection unit transfers the addresses of the failed data-storage unit to the nonvolatile memory unit for their nonvolatile storage.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.