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Method of arbitrating access to a data bus

  • US 7,360,002 B2
  • Filed: 03/26/2004
  • Issued: 04/15/2008
  • Est. Priority Date: 09/26/2001
  • Status: Expired due to Fees
First Claim
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1. A method of arbitrating access to a data bus among bus devices, wherein the bus devices are linked by a plurality of arbitration rings, comprising:

  • a) requesting access by a first one of the bus devices;

    b) checking whether a first signal, which indicates that one of the arbitration rings is enabled, is applied to an input of the first one of the bus devices;

    c) if the first signal is applied, outputting a second signal by the first one of the bus devices;

    d) checking whether, at the end of a predetermined time interval, the first signal is still applied at the input of the first one of the bus devices; and

    e) if the first signal is still applied at the end of the predetermined time interval, accessing the data bus by the first one of the bus devices;

    wherein a respective priority is assigned to each of the arbitration rings.

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