Semiconductor memory automatically carrying out refresh operation
US7099208B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 15, 2004 |
| Grant date | Aug 29, 2006 |
| Priority date | — |
| Expiry date | Dec 15, 2024 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11C29/783
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
An arbiter judges which of an internal access request and an external access request takes higher priority, when the internal access request conflicts with the external access request. A redundancy judgement circuit judges which of a normal memory cell and a redundancy memory cell is accessed, in accordance with each of the internal access request and the external access request. When the arbiter gives higher priority to the internal access request, the redundancy judgement circuit carries out redundancy judgement for the external access request during internal access operation. To prevent the malfunction of a memory core, a hold circuit holds redundancy judged result, and prevents the redundancy judged result for the external access request from being transmitted to the memory core that carries out the internal access operation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.