Semiconductor storage device and data control method thereof
US9063663B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 21, 2010 |
| Grant date | Jun 23, 2015 |
| Priority date | — |
| Expiry date | Jun 17, 2032 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F2212/7208
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
The flash memory controller compresses data in response to a write request. On condition that there is a compression effect with respect to the compressed data, the flash memory controller writes the compressed data to the base area of a physical block of a flash memory. As physical pages assigned to the physical block, the flash memory controller reduces the physical pages assigned to the base area from 102 down to 59, and increases the physical pages assigned to the update area from 26 up to 69. Therefore, it is possible to suppress exhaustion of physical pages which are assigned to the update area, to reduce the number of erases of the physical block, and to consequently prolong device operating life.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.