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. 15, 1992
Filed:
Aug. 21, 1990
Kenji Noguchi, Hyogo, JP;
Shinichi Kobayashi, Hyogo, JP;
Makoto Yamamoto, Hyogo, JP;
Tsuyoshi Toyama, Hyogo, JP;
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Abstract
A semiconductor memory device having an error checking and correcting (ECC) circuit is disclosed. This memory device includes data lines (10-21) from an ECC data generation circuit and bit lines (30-41) connected to the adjacent memory cells in a memory array (1), which are selectively connected at specified connecting portions (51, 52). When predetermined test data is inputted in order to detect undesired contact or interference between the memory cells, checker pattern data can be written in all the memory cells. Thus, despite the fact that the memory device includes an ECC circuit, a complete and easy memory cell checking is carried out.