Interface having plug and play function
First Claim
1. An interface having a plug and play function and connected to a host controller, wherein the interface performs a predetermined bus reset sequence in response to a bus reset generated by the plug and play function in accordance with a change in the status of an external bus, the interface comprising:
- an analysis circuit for analyzing data provided from the external bus during the bus reset sequence and for determining whether the bus reset sequence has been completed normally, wherein the analysis circuit provides the data to the host controller when the bus reset sequence has been completed normally.
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Accused Products
Abstract
An interface circuit having a plug and play function executes a predetermined bus reset sequence in response to a bus reset. During execution, the circuit analyzes relevant data to determine whether an error has occurred. If so, it deletes the information and re-issues the bus reset to re-execute the bus reset sequence. If an error has not occurred, the interface notifies the host controller and supplies it with the relevant data. Because the host controller is notified only if the reset sequence is executed successfully, the application software and the device driver do not process errors. Thus the interface prevents a detected abnormality from affecting the network.
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Citations
31 Claims
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1. An interface having a plug and play function and connected to a host controller, wherein the interface performs a predetermined bus reset sequence in response to a bus reset generated by the plug and play function in accordance with a change in the status of an external bus, the interface comprising:
an analysis circuit for analyzing data provided from the external bus during the bus reset sequence and for determining whether the bus reset sequence has been completed normally, wherein the analysis circuit provides the data to the host controller when the bus reset sequence has been completed normally.
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2. An interface system having a plug and play function and connected to a host controller, wherein the interface system performs a predetermined bus reset sequence in response to a bus reset generated by the plug and play function in accordance with a change in the status of an external bus, the interface system comprising:
an analysis circuit for analyzing data provided from the external bus during the bus reset sequence and determining whether the bus reset sequence has been completed normally, wherein the analysis circuit provides the data to the host controller when the bus reset sequence has been completed normally. - View Dependent Claims (3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. An interface that performs a predetermined connection procedure with a network, the interface comprising:
a self-diagnosis circuit for performing self-diagnosis of the interface prior to the predetermined connection procedure, wherein the interface suspends transition to the predetermined connection procedure when the self-diagnosis circuit generates a diagnosis indicating an abnormality of the interface. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
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24. A self-diagnosis method employed by an interface that performs a predetermined connection procedure with a network, wherein the interface has a plurality of ports, a transmitting circuit, and a receiving circuit, the plurality of ports including a first port and a second port, and the transmitting and receiving circuit each being connected to the plurality of ports, the self-diagnosis method comprising the steps of:
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connecting the first and second ports to each other prior to the predetermined connection procedure;
transferring data from the transmitting circuit to the receiving circuit via the first and second ports; and
comparing data transmitted by the transmitting circuit and data received by the receiving circuit. - View Dependent Claims (25, 26, 27, 28, 29, 30, 31)
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Specification