Soft program and soft program verify of the core cells in flash memory array
US6493266B1 · kind B1 · utility
Assignees
Inventors
Key dates
| Filing date | Apr 9, 2001 |
| Grant date | Dec 10, 2002 |
| Priority date | — |
| Expiry date | Apr 26, 2021 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11C16/0475
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A method and system are disclosed for memory cell soft program and soft program verify, to adjust, or correct the threshold voltage between a target minimum and maximum, which may be employed in association with a dual bit memory cell architecture. The method includes applying one reference voltage signal to the over erased core cell, and a different reference voltage signal to the reference cell, comparing the two currents produced by each, selectively verifying proper soft programming of one or more bits of the cell, determining that the dual bit memory cell is properly soft programmed. The method may also comprise selectively re-verifying proper soft programming of the cells after selectively soft programming at least one or more bits of the cell.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.