Universal Serial Bus circuit which detects connection status to a USB host
First Claim
1. A USB circuit comprising:
- a microprocessor which receives signaling concerning a 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 the connection status; and
wherein the USB circuit comprises connection status signaling means which analyze the USB power supply signal line and change the data signal transmitted down the first and second data lines according to the connection status of the USB circuit to the USB host circuit and simultaneously sends a “
1”
signal down each of the data lines to the microprocessor when the USB circuit is in a disconnected state.
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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.
27 Citations
29 Claims
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1. A USB circuit comprising:
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a microprocessor which receives signaling concerning a 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 the connection status; and
wherein the USB circuit comprises connection status signaling means which analyze the USB power supply signal line and change the data signal transmitted down the first and second data lines according to the connection status of the USB circuit to the USB host circuit and simultaneously sends a “
1”
signal down each of the data lines to the microprocessor when the USB circuit is in a disconnected state. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29)
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Specification
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- Resources
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Current AssigneeSeagate Technology LLC (Seagate Technology Holdings Plc)
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Original AssigneeNokia Corporation
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InventorsCroyle, Richard
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Primary Examiner(s)Ray, Gopal C.
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Application NumberUS10/096,925Publication NumberTime in Patent Office1,314 DaysField of Search710/305, 710/19, 710/15, 710/72, 710/17, 710/63, 710/313, 710/100, 710/300, 712/32, 712/36, 340/286.01, 709/224, 361/683, 361/686, 713/300US Class Current710/305CPC Class CodesG06F 13/4072 Drivers or receivers G06F13...G06F 13/4295 using an embedded synchroni...
