Apparatus and method for operating a peripheral device as either

Details Apparatus and method for operating a peripheral device as either Apparatus and method for operating a peripheral device as either

1996-05-03

1998-07-21

Harvey, Jack B.

G06F 300

Patent

active

057845816

ABSTRACT:
An apparatus capable of operating as either a master device or a slave device on a communication link such as a Universal Serial Bus (USB). The apparatus includes a first communication port which is utilized when the apparatus is operating as a slave device. A second communication port is utilized when the apparatus is operating as a master device. A device controller is coupled to both the first communication port and the second communication port. The device controller enables either the first communication port or the second communication port after detecting whether an active host controller is coupled to the first communication port. A timer may be used to determine the presence or absence of an active host controller.

REFERENCES:
patent: 4888802 (1989-12-01), Cooney
patent: 4890279 (1989-12-01), Lubarsky
patent: 5014267 (1991-05-01), Tompkins et al.
patent: 5438571 (1995-08-01), Albrecht et al.
patent: 5581729 (1996-12-01), Nishtala
Universal Serial Bus Specification, Version 1.0, Jan. 19, 1996.

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