Device configured as stand-alone or slave based on detection...

Details Device configured as stand-alone or slave based on detection... Device configured as stand-alone or slave based on detection...

2005-07-19

2005-07-19

Browne, Lynne H. (Department: 2116)

Electrical computers and digital processing systems: support

Computer power control

C713S320000, C713S340000

Reexamination Certificate

active

06920569

ABSTRACT:
A device is provided for use in a data bus system like a USB bus system. The device can be coupled to a host via a bus cable that comprises a data transfer conductor and power supply conductors. The device detects whether a power supply is connected to the power supply conductors. Dependent on whether or not connection of the power supply has been detected, the device starts operating in a slave mode or in a stand-alone mode respectively. In a slave mode the device waits for commands received via the data transfer conductor. In the stand-alone mode the device operates independently from communication via the cable. Preferably, the device signals back to the host whether it is in the slave mode by enabling pull-up of a potential of the data transfer conductor. In an embodiment, detection and signaling is controlled via single control node.

REFERENCES:
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patent: 6012103 (2000-01-01), Sartore et al.
patent: 6101076 (2000-08-01), Tsai et al.
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patent: 6128743 (2000-10-01), Rothenbaum
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patent: WO9908422 (1999-02-01), None
2findit. ‘Re: USB Problems’.In ISPnews [online]. alt.sys.pc-clone.dell newsgroup, Jan. 7, 1999; 21:38:52 EDT. Retrieved from the Internet: <URL: http://groups.google.com>, message ID<0del2.1054$MI3.1661@news15.ispnews.com>#1/1.□□.
Phillps Semiconductors, “Universal Serial Bus Standard”, May 1996, p. 7.

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