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:
Sep. 14, 1999
Filed:
May. 13, 1998
Kiyohiro Furutani, Hyogo, JP;
Tsukasa Ooishi, Hyogo, JP;
Mikio Asakura, Hyogo, JP;
Hideto Hidaka, Hyogo, JP;
Kei Hamade, Hyogo, JP;
Yoshito Nakaoka, Hyogo, JP;
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Abstract
Read drivers which are provided in correspondence to simultaneously selected plural bits of memory cells are wired-OR connected to internal read data buses which in turn are provided in correspondence to a plurality of memory cell arrays respectively. A test mode circuit is provided for the internal read data buses for detecting coincidence/incoincidence of logics of signal potentials on these internal read data bus lines. In a test operation, all read drivers are activated to read selected memory cell data on the corresponding internal read data bus lines.