The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 01, 1994
Filed:
Feb. 10, 1993
Applicant:
Inventors:
Laurent Sourgen, Aix en Provence, FR;
Rodolphe Uhlmann, Aix en Provence, FR;
Assignee:
SGS-Thomson Microelectronics, S.A., Gentilly, FR;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G06F / ;
U.S. Cl.
CPC ...
395425 ; 364D / ; 3642467 ; 365195 ; 365228 ;
Abstract
A decision circuit receives input addresses of instructions to be executed and data addresses to which the instructions are to be applied. The decision circuit either allows the execution of the instruction or prohibits the execution of the instruction if the instruction leads to a false operation or to a fraudulent attempt to divulge the system contents. A buffer register stores the instruction addresses and subsequently presents them to the decision circuit simultaneously with the data addresses. This device applies particularly to the protection of electronic integrated circuit memory cards.