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:
Aug. 25, 2009
Filed:
Oct. 04, 2006
Applicant:
Yoshiharu Kato, Kasugai, JP;
Inventor:
Yoshiharu Kato, Kasugai, JP;
Assignee:
Fujitsu Microelectronics Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H03K 19/094 (2006.01); H03K 19/0175 (2006.01);
U.S. Cl.
CPC ...
Abstract
This invention provides an interface circuit for detecting that a DQS signal from a DDR SDRAM is at an intermediate potential. An interface circuit is connected to at least a signal line which transmits the DQS signal from the DDR SDRAM and reaches an intermediate potential VM when the signal attains an inactive state. The interface circuit has a comparing portion for comparing the potential of the DQS with a threshold potential VREFH which is a potential that is different from the intermediate potential VM.