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:
Aug. 03, 1999
Filed:
Feb. 25, 1998
Applicant:
Inventor:
Shunichi Iwata, Tokyo, JP;
Assignee:
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G11C / ;
U.S. Cl.
CPC ...
365222 ; 3652385 ;
Abstract
In a semiconductor integrated circuit, a CPU (2), a DRAM (3), and a bus controller (5) are mounted on a same semiconductor chip. The bus controller (5) has a refresh control circuit (7, 70) including a refresh request circuit to output a refresh request at a constant timing, a forced refresh request circuit to output the refresh request at an optional timing that is different from the constant timing, and a refresh request stop circuit to output the refresh request forcibly.