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:
Sep. 06, 2005
Filed:
Nov. 04, 2003
Applicants:
James A. Dahlberg, Eagan, MN (US);
Obed Duardo, Coral Springs, FL (US);
Inventors:
James A. Dahlberg, Eagan, MN (US);
Obed Duardo, Coral Springs, FL (US);
Assignee:
Agere Systems Inc., Allentown, PA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G11C007/00 ;
U.S. Cl.
CPC ...
Abstract
A double data rate (DDR) synchronous dynamic RAM (SDRAM), or DDR-SDRAM, memory controller employing a delay locked loop (DLL) circuit to delay an SDRAM data strobe (DQS) signal to the center, or 'eye' of the read data window. However, in distinction from conventional techniques, the initial delay determined by the DLL is fine tuned with an offset determined by a memory test. Moreover, in an additional embodiment, the delay may be further adjusted during operation to compensate for environmental conditions by a PVT (process, value, temperature) circuit.