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:
Dec. 20, 2005
Filed:
May. 28, 2003
Applicants:
Masaya Mori, Kawasaki, JP;
Toshio Sunaga, Ohtsu, JP;
Shinpei Watanabe, Yokohama, JP;
Inventors:
Assignee:
International Business Machines Corporation, Armonk, NY (US);
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
G11C007/00 ;
U.S. Cl.
CPC ...
Abstract
The present invention relates to a DRAM having a memory array that is divided into a plurality of memory blocks. A memory block having a long data retention time is selected from the plurality of memory blocks and a logical address is allocated to the selected memory block. The selected memory block is refreshed at longer time intervals compared to conventional DRAMs resulting in lower power consumption.