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:
Oct. 26, 1999
Filed:
May. 12, 1998
John F Zumkehr, Orange, CA (US);
Amir A Abouelnaga, Great Falls, VA (US);
McDonnell Douglas Corp., St. Louis, MO (US);
TRW, Inc., Redondo Beach, CA (US);
Abstract
An instruction flow monitoring mechanism performs control flow error detection in a reduced instruction set computer (RISC) processor using signature monitoring. The signature monitoring is integrated into the RISC processor such that the instruction set of the RISC processor is enhanced to perform signature checking under all execution conditions. A signature monitor instruction causes the instruction flow to be checked for errors by comparing a pre-computed reference signature with a current signature and raising an error condition if the two signatures are unequal. The instruction also initializes the current signature.