Green eMMC device (GeD) controller with DRAM data persistence, data-type splitting, meta-page grouping, and diversion of temp files for enhanced flash endurance
US9405621B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 6, 2014 |
| Grant date | Aug 2, 2016 |
| Priority date | — |
| Expiry date | Dec 26, 2034 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11C2211/5641
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A controller for a Super Enhanced Endurance Device (SEED) or Solid-State Drive (SSD) increases flash endurance using a DRAM buffer. Host accesses to flash are intercepted by the controller and categorized as data types of paging files, temporary files, meta-data, and user data files, using address ranges and file extensions read from meta-data tables. Paging files and temporary files are optionally written to flash. Full-page and partial-page data are grouped into multi-page meta-pages by data type in the DRAM before storage by lower-level flash devices such as eMMC, UFS, or iSSD. Caches in the DRAM buffer for storing each data type are managed and flushed to the flash devices by the controller. Write dates are stored for pages or blocks for management functions. A spare/swap area in DRAM reduces flash wear. Reference voltages are adjusted when error correction fails.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.