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:
Jun. 13, 1995
Filed:
Aug. 20, 1993
Norio Hagiwara, Omiya, JP;
Kazuhisa Sakihama, Mountain View, CA (US);
Kabushiki Kaisha Toshiba, Kawasaki, JP;
Abstract
A semiconductor memory device having information data storing cells and error correction data storing memory cells. When information data is inputted, error correction data related to the information data is formed. In a usual use, the information data and the error correction data are stored in the corresponding memory cells. An external test signal, inputted as the information data, can be stored in the error correction data storing memory cells by a write control signal. In a usual use, the information data stored in the information data storing cells are outputted, as they are or corrected if erroneous. The test signal stored in the error correction data storing memory can be outputted by an output control signal.