Read scrub with adaptive counter management
US9552171B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 29, 2014 |
| Grant date | Jan 24, 2017 |
| Priority date | — |
| Expiry date | Mar 24, 2035 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11C2211/5648
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A number of complimentary techniques for the read scrub process using adaptive counter management are presented. In one set of techniques, in addition to maintaining a cumulative read counter for a block, a boundary word line counter can also be maintained to track the number of reads to most recently written word line or word lines of a partially written block. Another set of techniques used read count threshold values that vary with the number of program/erase cycles that a block has undergone. Further techniques involve setting the read count threshold for a closed (fully written) block based upon the number reads it experienced prior to being closed. These techniques can also be applied at a sub-block, zone level.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.