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:
Dec. 04, 1990
Filed:
Dec. 12, 1988
Applicant:
Inventors:
Takeo Nakabayashi, Hyogo, JP;
Harufusa Kondou, Hyogo, JP;
Assignee:
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G11C / ;
U.S. Cl.
CPC ...
365 49 ; 36518901 ; 364200 ; 364900 ;
Abstract
A content addressable memory device capable of correct retrieval operation comprises a flag bit column (12) provided in a memory cell array. The flag bit column (12) stores a flag signal indicating whether a word is in a data written state or an empty state for each word in a data array (2). In the retrieval operation, the data written in the data array (2) and a flag bit column (12) are simultaneously retrieved, providing a correct retrieval result. In addition, since the flag bit column (12) is provided in the memory cell array, it can be controlled in a manner similar to controlling the data array (2).