Semiconductor device having a volatile semiconductor memory and a nonvolatile semiconductor memory which performs read/write using different size data units
US8065471B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 2, 2009 |
| Grant date | Nov 22, 2011 |
| Priority date | — |
| Expiry date | Sep 2, 2029 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F2212/7209
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A semiconductor storage device includes a first memory area configured in a volatile semiconductor memory, second, third, and fourth memory areas configured in a nonvolatile semiconductor memory, and a controller which executes following processing. The controller executes a first processing for storing a plurality of data by the first unit in the first memory area, a second processing for storing data by a first management unit in the fourth memory area, a third processing for storing data by a second management unit in the third memory area, a fourth processing for moving an area of the third unit having the oldest allocation order in the fourth memory area to the second memory area, and a fifth processing for selecting data in the second memory area and copying the selected data to an empty area of the third unit in the second memory area.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.