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Device having priority upgrade mechanism capabilities and a method for updating priorities

  • US 8,078,781 B2
  • Filed: 08/23/2006
  • Issued: 12/13/2011
  • Est. Priority Date: 08/23/2006
  • Status: Active Grant
First Claim
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1. A device having priority update capabilities, the device comprises:

  • an arbiter adapted to arbitrate between a plurality of transaction requests in response to priority attributes associated with the transaction requests; and

    a first sequence of pipeline stages that precede the arbiter, at least one pipeline stage of the first sequence of pipeline stages being adapted to receive a request to update a priority of a particular transaction request of the plurality of transaction requests that is stored within the at least one pipeline stage to a requested priority; and

    the device being adapted to;

    update the priority of the particular transaction request stored in the at least one pipeline stage for a particular arbitration cycle, if the particular transaction request is priority upgradeable and if the requested priority is higher than a current priority of the particular transaction request; and

    selectively mask another transaction request stored in the at least one pipeline stage for the particular arbitration cycle.

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