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:
Jul. 20, 1999
Filed:
Aug. 01, 1997
Takuya Ariki, Tokyo, JP;
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Abstract
The semiconductor memory device of the present invention comprises a mode setting means for setting the test mode; a circuit for transferring data provided to one of the input/output pins in a group of a given number of input/output pins to each of the rest of the group when the test mode is set; a circuit provided for each input/output pin which, when the test mode is set, selectively inverting the data signal values provided to the input/output pins or retrieved from the memory cells so that the order of the specified logical addresses coincides with the order of the physical addresses of the memory cells; and a circuit for deciding whether or not the data reading operation has been properly performed from the data retrieved from the memory cells to the given number of input/output pins and for sending out a signal indicating the decision to one of the input/output pins in the group of the given number of input/output pins.