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:
Jun. 22, 2010
Filed:
Dec. 20, 2007
Ross A. Kohler, Allentown, PA (US);
Richard J. Mcpartland, Nazareth, PA (US);
Wayne E. Werner, Coopersburg, PA (US);
Ross A. Kohler, Allentown, PA (US);
Richard J. McPartland, Nazareth, PA (US);
Wayne E. Werner, Coopersburg, PA (US);
Agere Systems Inc., Allentown, PA (US);
Abstract
A technique to reduce refresh power in a DRAM. In one embodiment, all of the DRAM memory cells are refreshed at a first rate and a subset of the memory cells are refreshed a second rate greater than the first rate. In another embodiment, the DRAM has a refresh controller that generates a refresh address and controls the refresh of the memory cells addressed by the refresh address. A marker memory is used by the refresh controller to determine which of the memory cells requires refreshing at a rate faster than the refresh rate of the remaining memory cells. Testing the DRAM uses a method to determine which of the memory cells are to be refreshed at the faster rate and to store the results in the marker memory.