Electrically disconnecting a peripheral device
DCFirst Claim
1. A System, comprising:
- a processor;
a host controller coupled to the processor; and
a device coupled to the host controller;
wherein the device is electrically disconnected from the host controller if the device is not in an active state; and
wherein the device being electrically disconnected from the host controller causes an appearance to the host controller that the device is not coupled to the host controller.
6 Assignments
Litigations
2 Petitions
Accused Products
Abstract
If a USB device is turned off or is not active, the device may be electrically disconnected from a USB host controller. The device may be electrically disconnected through a physical interface on the device. In some embodiments, if the device becomes active during a wait period (e.g., 2-3 seconds) prior to electrically disconnecting the device, the device may not be electrically disconnected. In some embodiments, when the device is electrically disconnected from the USB host controller and no system activity of a bus mastering peripheral is occurring, the CPU may enter a low power state if other conditions are met. In some embodiments, if the USB device becomes active after electrically disconnecting, the electrical disconnection may be discontinued.
52 Citations
25 Claims
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1. A System, comprising:
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a processor; a host controller coupled to the processor; and a device coupled to the host controller; wherein the device is electrically disconnected from the host controller if the device is not in an active state; and wherein the device being electrically disconnected from the host controller causes an appearance to the host controller that the device is not coupled to the host controller. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method, comprising:
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detecting whether a device coupled to a host controller is in an active state; if the device is not in an active state, electrically disconnecting the device from a host controller, wherein electrically disconnecting the device from the host controller causes an appearance to the host controller that the device is not coupled to the host controller; and if the device is in an active state, maintaining an electrical connection between the device and the host controller. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21)
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22. A computer accessible memory medium that stores program instructions, wherein the program instructions are executable by a processor to:
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detect whether a device coupled to a host controller is in an active state; if the device is not in an active state, electrically disconnect the device from a host controller, wherein electrically disconnecting the device from the host controller causes an appearance to the host controller that a device is not coupled to the host controller; and if the device is in an active state, maintain an electrical connection between the device and the host controller. - View Dependent Claims (23, 24, 25)
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Specification