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:
Nov. 01, 1994
Filed:
May. 28, 1993
Yuto Ikeda, Hyogo, JP;
Yoshinori Inoue, Hyogo, JP;
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Abstract
The present invention relates to a memory device having reduced access time of memory cells in a test mode. The memory device forms, in the test mode, read data D.sub.R by applying Ex-OR processing to a plurality of data read from a memory cell array 11 by a data processing circuit 5, to provide the formed data to the outside through a data output circuit 6. The timing of the output of data to the outside is delayed, by delay circuit 12 in the test mode, than that in the normal operation by a time period corresponding to time required for the EX-OR processing in data processing circuit 5. Consequently, output of invalid data to the outside can be prevented, and thus access time of valid data can be reduced.