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:
Oct. 16, 2001
Filed:
Dec. 18, 1998
Applicant:
Inventors:
Naoya Watanabe, Hyogo, JP;
Yoshikazu Morooka, Hyogo, JP;
Assignee:
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G11C 7/00 ;
U.S. Cl.
CPC ...
G11C 7/00 ;
Abstract
Each SLDRAM tests a built in memory section in response to a test execution command supplied from a memory controller and sends a defective address to memory controller. Memory controller stores the defective address of each SLDRAM and accesses only to a normal address and does not access to the defective address. The rate of memory capacity decrease of a main memory can be suppressed compared with a conventional technique where an SLDRAM having a defective address is not accessed.