Apparatus and method for operating a peripheral device as either a master device or a slave device
Patent 5784581 Issued on July 21, 1998. Estimated Expiration Date: 
May 3, 2016. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
May 3, 2016. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesSystem and method for providing for secure encryptor key management Multiplexer and computer network using the same Video conferencing network High speed data transfer over twisted pair cabling Parallelized coherent read and writeback transaction processing system for use in a packet switched cache coherent multiprocessor system Patent #: 5581729 InventorApplicationNo. 642387 filed on 05/03/1996US Classes:710/110Bus master/slave controllingExaminersPrimary: Harvey, Jack B.Assistant: Wiley, David Attorney, Agent or FirmInternational ClassG06F 003/00AbstractAn 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.Other References
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