Methods for row hammer mitigation and memory devices and systems employing the same
US11087819B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 9, 2019 |
| Grant date | Aug 10, 2021 |
| Priority date | — |
| Expiry date | Oct 9, 2039 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11C2211/4061
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
Memory devices and methods of operating memory devices in which refresh management operations can be scheduled on an as-needed basis for those memory portions where activity (e.g., activations in excess of a predetermined threshold) warrants a refresh management operation are disclosed. In one embodiment, an apparatus comprises a memory including a memory location, and circuitry configured to determine a count corresponding to a number of activations at the memory location, to schedule a refresh management operation for the memory location in response to the count exceeding a first predetermined threshold, and to decrease the count by an amount corresponding to the first predetermined threshold in response to executing the scheduled refresh management operation. The circuitry may be further configured to disallow, in response to determining that the count has reached a maximum permitted value, further activations at the memory location until after the count has been decreased.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.