Method for ensuring security of program data in one-time programmable memory
US6160734A · kind A · utility
54Cited by
5References
14Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 28, 1999 |
| Grant date | Dec 12, 2000 |
| Priority date | — |
| Expiry date | May 28, 2019 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F21/79
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
This application describes a method of protecting data and program code stored in an EPROM array from piracy. The security scheme allows for segmentation of the array to protect one section of the array from reading while programming a non-secure section. The security scheme also allows for protection of the entire array after programming is complete. It also incorporates a device to prevent tampering with the segmentation registers and a means to prevent circumvention of the security scheme even when the processor is in one or more of its test modes.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.