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Method and system for keeping two independent busses coherent

  • US 7,328,300 B2
  • Filed: 10/16/2003
  • Issued: 02/05/2008
  • Est. Priority Date: 09/26/2000
  • Status: Expired due to Fees
First Claim
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1. A method for keeping two independent busses coherent comprising:

  • writing data from an Input/Output (I/O) controller to a memory, the I/O controller sending the data to the memory via a first bus connected to a first port of a memory controller and the I/O controller;

    sending a tag, from the I/O controller, after the data via the first bus through the first port, the tag being received by the memory controller;

    requesting completion status of the data write from the I/O controller by a processing unit, the request being sent to the I/O controller via a second bus connected to a second port of the memory controller and the I/O controller; and

    waiting for a tag acknowledgment, by the I/O controller, from the memory controller before providing notification to the processing unit that the data write has completed, wherein the first bus and the second bus are coherent.

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