Flash memory having data refresh function and data refresh method of flash memory
US5574684A · kind A · utility
95Cited by
4References
14Claims
0Family size
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Key dates
| Filing date | Jun 5, 1995 |
| Grant date | Nov 12, 1996 |
| Priority date | — |
| Expiry date | Jun 5, 2015 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11C29/52
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A flash memory and its data refresh method, where data read out in program verify mode and erase verify mode from read address are compared in each address (ST110), and data of a memory cell corresponding to inconsistent data are rewritten (ST112). Or adding values of data read out in the program verify mode and the erase verify mode are compared in each block (ST137) and a defective block is retrieved and data in each address are compared in the defective block (ST160), and data of a memory cell corresponding to inconsistent data are rewritten (ST162). Thereby, defective data can be retrieved and corrected.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.