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. 05, 1986
Filed:
Jun. 09, 1983
Takashi Shinoda, Kodaira, JP;
Kikuo Sakai, Hachiohji, JP;
Masahiro Ogata, Kodaira, JP;
Hiroshi Kawamoto, Kodaira, JP;
Yoshiaki Onishi, deceased, late of Kokubunji, JP;
Junko Onishi, administratrix, Nagoya, JP;
Hitachi, Ltd., Tokyo, JP;
Hitachi Microcomputer Engineering Ltd., Tokyo, JP;
Abstract
YA semiconductor memory is provided with memory cells for storing a plurality of sets of data, each of the sets having check bits. A selecting circuit selects some of the memory cells to form a set in response to a first address signal. The circuit includes an error correcting code circuit, a tristate circuit and a control circuit which forms a control signal to control the tristate circuit. Output terminals of the tristate circuit are coupled with external output terminals of the semiconductor memory. Also, the tristate circuit is controlled by the control signal to bring the external circuit terminals into high impedance at least during the time when the error correcting code circuit is delivering indefinite data.