Program and erase disabling control of WPCAM by double controls
US7934051B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 1, 2008 |
| Grant date | Apr 26, 2011 |
| Priority date | — |
| Expiry date | Feb 19, 2030 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11C16/22
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
The present invention provides a semiconductor device and a method for controlling the semiconductor device, the semiconductor device including memory regions that include nonvolatile memory cells; program prohibition information units, the program prohibition information units storing program prohibition information to be used for determining whether to prohibit or allow programming in a plurality of memory regions corresponding to the program prohibition information units; a first prohibition information control circuit that prohibits a change of the program prohibition information from a program prohibiting state to a program allowing state with respect a memory region, the memory region is one of the plurality of corresponding memory regions, based on first prohibition information to be used for determining whether to prohibit a change of the program prohibition information from a program prohibiting state to a program allowing state with respect to the corresponding memory region; and a second prohibition information control circuit that prohibits a change of the program prohibition information from a program allowing state to a program prohibiting state with respect to the co…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.