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US 6,647,452 B1Granted
Automatic recovery of non-responsive peripheral device by apparent disconnect and reconnect
AssigneeAlps Electric Co., Ltd.
InventorYuko Sonoda
Life of this patent
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AssigneeAlps Electric Co., Ltd.
InventorYuko Sonoda
Estimating the term…
A change-over switch is disposed on a line of a peripheral device. The change-over switch is controlled by a control unit provided within a USB controller. When a host discontinues a polling operation to the peripheral device, the peripheral device first opens the circuit of the change-over switch so as to decrease the potential at a point of the host to substantially the same potential of a ground line. Then, the peripheral device closes the circuit of the change-over switch to increase the potential at the point to be close to a power supply voltage. Accordingly, the host determines that the peripheral device is reconnected to the host, and starts the polling operation. In this way, the peripheral device is apparently disconnected and reconnected, thereby allowing for recovery without the actual physical disconnection and reconnection of the peripheral device.
A connection unit for a peripheral device, which is connected to a host via a data line, said data line being set at a predetermined potential when communication is performed between said peripheral device and said host, said connection unit comprising:
A connection unit for connecting a peripheral device to a host via a data line, said data line being in a first state at a first potential when communication is performed between said peripheral device and said host, and wherein, after a communication interruption, said host reestablishes communication upon the potential of said data line changing from said first state to a second state and then returning to said first state, said connection unit comprising:
Dependencies are inferred from the claim text.