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:
Oct. 18, 2005
Filed:
Mar. 14, 2002
Richard Croyle, Mytchett, GB;
Richard Croyle, Mytchett, GB;
Nokia Corporation, Espoo, FI;
Abstract
The invention relates to universal serial bus circuits utilized in USB devices and USB hubs. Specifically, the invention relates to circuitry used to detect whether the hub or device is connected td a USB host, i.e. to detect connection status of the device or hub. The present invention provides a USB circuit comprising a microprocessor which receives signaling concerning the connection status of the USB circuit to a USB host circuit, first and second data signal lines which transmit respective first and second data signals to the microprocessor, a USB host power supply signal line which receives USB host power signaling to indicate connection status, and wherein the USB circuit analyzes the USB power supply signal line and change the data signal transmittal down the first and second data lines according to the connection statas of USB circuit to the USB host circuit.