Method and apparatus for preservation of failure state in a read destructive memory
US7168026B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 22, 2001 |
| Grant date | Jan 23, 2007 |
| Priority date | — |
| Expiry date | Aug 25, 2023 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11C29/44
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
One aspect of the invention provides a novel scheme to preserve the failure state of a memory location. According to one embodiment, the data is read from a memory location in a read-destructive memory device. If the data is found to be valid (uncorrupted) it is written back to the memory location from where it was read in order to preserve it. If the data is found to be invalid (corrupted) then a failure codeword is written in the memory location to indicate a failure of the memory location. The failure codeword may be preselected or dynamically calculated so that it has a mathematical distance greater than all correctable data patterns.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.