The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 27, 2021
Filed:
Oct. 01, 2018
Commissariat a L'energie Atomique ET Aux Energies Alternatives, Paris, FR;
Valentin Gherman, Palaiseau, FR;
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.