Third party evavesdropping for bus control
First Claim
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1. A communication system for providing a continuous communications channel between two of a plurality of data processing system elements, said system comprising:
- an information bus;
a plurality of ports, each port connected to at least one unique data processing system element and to said information bus, each port including control means for requesting or granting a channel connection with another of said ports; and
switch means connected to said information bus and each of said ports for establishing said continuous communications channel between a requesting port and a granting port in response to a grant from the granting port.
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Abstract
A communication system for providing a communication path between two of a plurality of devices. A first port is provided that is connected to at least one device. A second port is provided connected to a second device. A switch is provided connecting the two ports for communications connection between the ports in response to commands form the devices to each other. The switch includes the capability to monitor communications between the devices and to determine when a change is to be made in the communications path and then to make the change accordingly.
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Citations
16 Claims
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1. A communication system for providing a continuous communications channel between two of a plurality of data processing system elements, said system comprising:
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an information bus; a plurality of ports, each port connected to at least one unique data processing system element and to said information bus, each port including control means for requesting or granting a channel connection with another of said ports; and switch means connected to said information bus and each of said ports for establishing said continuous communications channel between a requesting port and a granting port in response to a grant from the granting port. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A communications system for providing a continuous communications channel between two of a plurality of data processing system elements, said system comprising:
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an information bus; a plurality of ports, each port connected to at least one unique data processing system element and to said information bus, each port including control means for requesting or granting a channel connection with another of said ports; and switch means connected to said information bus and each of said ports for establishing said continuous communications channel between ports and for disconnecting the channel in response to information transmitted by one of said connected ports over the channel. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15)
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16. In a communication system including an information bus, a plurality of ports, each port connected to at least one unique data processing system element and to said information bus, and a switch means connected to said information bus and each of said ports, for providing a continuous communication channel between two of a plurality of data processing system elements, a method of regulating communications comprising the steps of:
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generating in each port signals requesting or granting channel connection with another of said ports; transmitting requesting or granting signals directly to respective ports; and establishing said continuous communications channel between a requesting port and a granting port responsive to detected states of the requesting port or granting port signals.
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Specification