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Memory arbitration system and method having an arbitration packet protocol

  • US 8,555,006 B2
  • Filed: 11/21/2011
  • Issued: 10/08/2013
  • Est. Priority Date: 03/24/2004
  • Status: Active Grant
First Claim
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1. A method of responding to a read request in a system memory having a responding hub and at least one interposing hub through which a read response is transmitted on a data path of the interposing hub, the method comprising:

  • retrieving read data from a memory device coupled to the responding hub and preparing a read response including the read data;

    generating an arbitration packet including data indicative of a data path configuration for the read response, the arbitration packet having a plurality of 8-bit bytes including at least one byte including data used by the interposing hub to distinguish the arbitration packet from a read response;

    providing the arbitration packet and the read response to the interposing hub, the arbitration packet provided prior to the read response; and

    enabling a data path for the read response in the interposing hub in accordance with the data of the arbitration packet.

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