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:
Jan. 30, 1990
Filed:
Feb. 19, 1988
Applicant:
Inventor:
Cevat Kumbasar, Irvine, CA (US);
Assignee:
Unisys Corporation, Blue Bell, PA (US);
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G11C / ;
U.S. Cl.
CPC ...
365 49 ; 36518902 ; 365 94 ; 364900 ;
Abstract
A non-reprogrammable ROM holding microinstruction words cooperates with a Content Addressable Memory made of a TAG Memory and Data Memory. Portions of the locations in the TAG Memory have the same address as certain locations in the ROM so that when these selected addresses occur, a multiplexer will select the updated data from the Data Memory rather that from the ROM. The entire system is placed on one chip and provides great spatial surface savings over that which would be required if only a Static RAM were used for a control storage unit to hold the microinstruction words.