Green NAND device (GND) driver with DRAM data persistence for enhanced flash endurance and performance
US9223642B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 26, 2013 |
| Grant date | Dec 29, 2015 |
| Priority date | — |
| Expiry date | Feb 6, 2034 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F11/2015
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A Green NAND Device (GND) driver application queries AC line and battery status and then stores an image of processor states and caches and a resume routine to DRAM when power failure occurs. A DRAM image is then stored to flash memory for a persistent mode when battery power is available. The image in DRAM may be a partial image that includes entries, flushed caches, processor contexts, ramdisks, write caches, and a resume context. Endurance of flash memory is increased by a Super Enhanced Endurance Device (SEED) SSD. In a power down mode, the GND driver limits DRAM use and only caches in DRAM data that can be deleted on power down. Host accesses to flash are intercepted by the GND driver and categorized by data type. Paging files and temporary files cached in DRAM are optionally written to flash.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.