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. 02, 1999
Filed:
Dec. 18, 1995
Applicant:
Inventors:
Mathieu Lisart, Aix en Provence, FR;
Laurent Sourgen, Aix en Provence, FR;
Assignee:
SGS-Thomson Microelectronics S.A., Gentilly, FR;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G06F / ; G11C / ;
U.S. Cl.
CPC ...
713200 ; 711152 ; 711163 ; 365195 ;
Abstract
The access to memory words of an integrated circuit is protected by the creation of a decision table that receives addresses of instruction words and/or data words to be protected and that receives also addresses of the control bits of a control word assigned to a word to be protected. It can be shown that this mode of action provides greater security through the use of a decision table made in wired circuit form as well as greater flexibility through the programmable quality of the control words assigned to each memory word to be controlled.