Device and method for controlling the data refresh cycles in reprogrammable non-volatile memories
US10990477B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Oct 1, 2018 |
| Grant date | Apr 27, 2021 |
| Priority date | — |
| Expiry date | Oct 1, 2038 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11C2029/0411
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A method for controlling the refresh of data in reprogrammable nonvolatile memories includes a plurality of memory pages for storing data. The method performs the steps of: identifying with an error correction code errors in a read memory page; computing among the identified errors the number of retention errors and of non-retention errors, the non-retention errors especially comprising repeated read or programming errors; computing the retention age of the read memory page; estimating the remaining retention time for the read memory page depending on the parameters number of retention errors, number of non-retention errors and retention age computed beforehand; comparing the estimated value of the remaining retention time to a predefined value corresponding to a maximum time interval between two successive operations of reading a memory page; and determining whether the read memory page must be refreshed or not depending on the results of the comparison determining whether the page must be refreshed or not depending on the estimated value of the remaining retention time.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.