Nonvolatile memory system with retention monitor
US10332613B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | May 18, 2015 |
| Grant date | Jun 25, 2019 |
| Priority date | — |
| Expiry date | Jan 26, 2036 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11C2029/0411
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A nonvolatile memory system, a nonvolatile memory controller and a method for assuring retention are disclosed. The nonvolatile memory controller includes a retention monitor that stores test characteristics corresponding to a use case and determines, each time that a read of a codeword is performed, whether the number of errors in the codeword exceed a retention threshold. If the number of errors in the codeword exceed the retention threshold, the block containing the codeword is retired. The retention monitor performs retention tests during the operation of the memory controller and adjusts the retention threshold when the results of the retention tests indicate deviation from the test characteristics corresponding to a use case.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.