Universal Serial Bus circuit which detects connection status...

Details Universal Serial Bus circuit which detects connection status... Universal Serial Bus circuit which detects connection status...

2005-10-18

2005-10-18

Ray, Gopal C. (Department: 2111)

Electrical computers and digital data processing systems: input/

Intrasystem connection

Bus interface architecture

C710S313000

Reexamination Certificate

active

06957292

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.

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“An embedded converter from RS232 to Universal Serial Bus” by de Almeida Pereira Zuquim, L..D.; coelho, C.J.N., Jr.; Fernandes, A>O>; de Oliveira, M.P.; Tavares, A.J. (abstract only) Pub. date: Sep. 10-15, 2001.
“Analog circuit development system” by Jankovec, M. (abstract only) Pub. date: Sep. 22-24 (2003).
International Search Report.

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