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. 25, 1990
Filed:
Jan. 04, 1989
Applicant:
Inventors:
Nobuo Yosida, Ohme, JP;
Teruhisa Shimizu, Ohme, JP;
Assignee:
Hitachi, Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G06F / ;
U.S. Cl.
CPC ...
371 511 ; 371 211 ;
Abstract
A memory management unit is capable of judging that a specific bit has been partially rewritten by checking it against a dummy bit stored in a tag memory which is included in the memory management unit and thus correcting a parity bit. Accordingly, it is possible to accurately execute a parity check operation and it is also possible to improve the throughput of the memory management unit and hence promote lowering in the cost.