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:
Jul. 13, 2010
Filed:
Oct. 21, 2008
Tsuneo Abe, Tokyo, JP;
Tsuneo Abe, Tokyo, JP;
Elpida Memory, Inc., Tokyo, JP;
Abstract
A DLL circuit includes: a phase determining circuit that compares phases of respective rising edges of CK and LCLK to generate a determining signal R-U/D; a phase determining circuit that compares phases of respective falling edges of CK and LCLK to generate a determining signal F-U/D; a first adjusting circuit that adjusts a position of an active edge of LCLKR based on the determining signal R-U/D; a second adjusting circuit that adjusts a position of an active edge of LCLKF based on the determining signal F-U/D; a clock generating circuit that generates LCLK based on LCLKR and LCLKF; and a stop circuit that stops an adjusting operation by the second adjusting circuit in response to an adjusting direction of the active edge of LCLKR being opposite to each other to an adjusting direction of the active edge of LCLKF.