Arbitration in the case of a delaying bus coupling
First Claim
1. A method for connecting bus segments by means of interconnected coupling units connected to one bus segment each, comprising the steps of:
- providing substantially similar coupling units;
using one arbitration procedure for the bus segments;
permitting via the arbitration procedure interruption by a respective coupling unit without the respective coupling unit obtaining control over the bus segment connected thereto;
providing that at most one of the coupling units has a state A authorizing arbitration while all other coupling units have a state B not authorizing arbitration;
providing that if a respective coupling unit is in the state B not authorizing arbitration, the respective coupling unit itself interrupts all arbitration on the bus segment connected without obtaining control over just this bus segment, and the respective coupling unit transmitting at least one request at least to the coupling unit in the state A authorizing arbitration;
providing that if a respective coupling unit in the state A authorizing arbitration receives a request, the respective coupling unit transmits an authority to the requesting coupling unit and simultaneously changes into the state B not authorizing arbitration without acting on the bus segment connected thereto in the process; and
providing that a coupling unit chances into the state A authorizing arbitration by receiving an authorization.
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Accused Products
Abstract
Bus segments are connected using interconnected coupling units that are connected to one bus segment each. The coupling units are essentially similar, and the bus segments respectively use one arbitration procedure. The respective arbitration procedure permits interruption by the respective coupling unit without the coupling unit for this purpose obtaining control over the bus segment connected to it. At most one of the coupling units has a state A authorizing arbitration while all the others have a state B not authorizing arbitration. If a coupling unit is in the state B not authorizing arbitration, it itself interrupts all arbitration on the bus segment connected to it without for this purpose obtaining control over just this bus segment, and transmits at least one request at least to the coupling unit in the state A authorizing arbitration. If a coupling unit in the state A authorizing arbitration receives a request, it transmits an authority to the requesting coupling unit and simultaneously changes into the state B not authorizing arbitration without acting on the bus segment connected to it in the process. A coupling unit changes into the state A authorizing arbitration by receiving an authorization.
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Citations
12 Claims
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1. A method for connecting bus segments by means of interconnected coupling units connected to one bus segment each, comprising the steps of:
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providing substantially similar coupling units; using one arbitration procedure for the bus segments; permitting via the arbitration procedure interruption by a respective coupling unit without the respective coupling unit obtaining control over the bus segment connected thereto; providing that at most one of the coupling units has a state A authorizing arbitration while all other coupling units have a state B not authorizing arbitration; providing that if a respective coupling unit is in the state B not authorizing arbitration, the respective coupling unit itself interrupts all arbitration on the bus segment connected without obtaining control over just this bus segment, and the respective coupling unit transmitting at least one request at least to the coupling unit in the state A authorizing arbitration; providing that if a respective coupling unit in the state A authorizing arbitration receives a request, the respective coupling unit transmits an authority to the requesting coupling unit and simultaneously changes into the state B not authorizing arbitration without acting on the bus segment connected thereto in the process; and providing that a coupling unit chances into the state A authorizing arbitration by receiving an authorization. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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Specification