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:
Apr. 01, 1986
Filed:
Jun. 22, 1983
Applicant:
Inventor:
John A Celio, San Diego, CA (US);
Assignee:
NCR Corporation, Dayton, OH (US);
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G06F / ; G06F / ; G06F / ; G11C / ;
U.S. Cl.
CPC ...
364200 ;
Abstract
A virtual address and access protection code stored at that address are fetched simultaneously from secondary memory and stored in corresponding locations in first and second content addressable memories. When a program-generated virtual address is later applied to the first content addressable memory, corresponding access code is simultaneously applied to the second content addressable memory. Match signals obtained simultaneously from corresponding locations in both content addressable memories are combined to produce an access control signal to control access to data stored at a real memory address corresponding to the matched virtual address.