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:
Sep. 04, 1990
Filed:
Feb. 24, 1989
Applicant:
Inventors:
Assignee:
Fujitsu Limited, Kawasaki, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G06I / ;
U.S. Cl.
CPC ...
364900 ; 364969 ; 3649692 ; 3649481 ; 3649475 ;
Abstract
A storage-protection-check circuit includes a storage key corresponding to the unit area of a storage region, the storage key being stored in a key storage. The value of the access request key having an access request corresponding to the storage region is checked. When the access request key has a specified value, the storage region is accessed without reading the storage key out of the key storage.