Start-up state machine
First Claim
Patent Images
1. A communication device comprising:
- a transmitter;
a receiver; and
a state machine coupled to the transmitter and to the receiver, the state machine controlling the initiation of a communication link for the communication device by determining bit patterns for transmission by the transmitter at the full data rate based upon the status of the receiver and information contained in a signal transmitted by a remote communication device through a communication channel to the receiver.
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Abstract
State machines are disclosed for establishing a communication channel between communication devices, such as for example, between two modems in a backplane environment. In accordance with one embodiment, a start-up state machine employs the full data rate signaling scheme of the communication device to initiate a communication channel between two communication devices. By sending predefined bit patterns using the existing signaling scheme, the communication devices can determine the state of each other, establish a communication link, and determine when the communication of data or other desired information can occur.
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Citations
19 Claims
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1. A communication device comprising:
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a transmitter;
a receiver; and
a state machine coupled to the transmitter and to the receiver, the state machine controlling the initiation of a communication link for the communication device by determining bit patterns for transmission by the transmitter at the full data rate based upon the status of the receiver and information contained in a signal transmitted by a remote communication device through a communication channel to the receiver. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method of establishing a communication link between a local communication device and a remote communication device, the method comprising:
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transmitting at a full data rate a first bit pattern from the local communication device to the remote communication device if a receiver of the local communication device is not locked to an incoming signal;
transmitting at a full data rate a second bit pattern from the local communication device to the remote communication device if the receiver of the local communication device is locked to an incoming signal; and
establishing the communication link for transmission of desired information when the receiver of the local communication device is locked and is receiving the second bit pattern from the remote communication device. - View Dependent Claims (12, 13, 14, 15)
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16. A communication device comprising:
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a receiver adapted to receive an input signal;
a transmitter to transmit an output signal;
a detection circuit adapted to detect the receipt of the input signal; and
a state machine, coupled to the receiver, the transmitter, and the detection circuit, adapted to control start-up of the communication device to establish a communication link with a remote communication device, wherein the state machine determines bit patterns to transmit at a full data rate based upon the status of the detection circuit, the receiver, and the input signal. - View Dependent Claims (17, 18, 19)
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Specification