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. 12, 1999
Filed:
Jun. 07, 1995
Daniel L Fowler, Georgetown, TX (US);
William Edward Baker, Austin, TX (US);
William Patterson Bunton, Austin, TX (US);
Gary F Campbell, Palo Alto, CA (US);
Richard W Cutts, Jr, Georgetown, TX (US);
David J Garcia, Los Gatos, CA (US);
Paul N Hintikka, Austin, TX (US);
Robert W Horst, Saratoga, CA (US);
Geoffrey I Iswandhi, Sunnyvale, CA (US);
David P Sonnier, Austin, TX (US);
William Joel Watson, Austin, TX (US);
Frank A Williams, Austin, TX (US);
Tandem Computers Incorporated, Cupertino, CA (US);
Abstract
A multiprocessor system includes a number of central processing unit (CPUs) and at least one input/output (I/O) device interconnected by routing apparatus for communicating packetized messages therebetween. The messages contain address information identifying the source and destination of the message, and may also contain requests to write to, or read from, storage of a CPU. Protection against errant reads or writes is provided by an access validation method that utilizes access validation information contained in plural entries maintained by each CPU. Each entry provides validation by identifying what elements of the system has read and/or write wccss to the memory of that CPU, without which memory access is denied.