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:
Feb. 05, 2002
Filed:
Sep. 22, 2000
Applicant:
Inventors:
Kenji Sato, Miyazaki, JP;
Osamu Kuroki, Miyazaki, JP;
Assignee:
Oki Electric Industry Co., Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G11C 7/00 ;
U.S. Cl.
CPC ...
G11C 7/00 ;
Abstract
A field memory includes a DRAM core, a processor that generates and supplies a RAS control signal to the DRAM core, and a RAS cycle monitor circuit. The RAS cycle monitor circuit includes a counter circuit that counts the number of cycles of a RAS control signal supplied to a DRAM core in a predetermined period of time, and a monitor circuit that detects whether the number of cycles of the RAS control signal is within a normal operating range. The monitor circuit supplies a monitor output signal to indicate whether the RAS control signal is being generated on a proper cycle.