×

Method of monitoring system bus traffic by a CPU operating with reduced power

  • US 5,809,314 A
  • Filed: 04/02/1997
  • Issued: 09/15/1998
  • Est. Priority Date: 12/23/1994
  • Status: Expired due to Term
First Claim
Patent Images

1. In a multiprocessor computer system, a method for maintaining data coherency in a reduced power operating mode, comprising the steps of:

  • placing a first processor in a reduced power mode;

    monitoring activity on a common bus using circuitry of the first processor that is active in the reduced power mode;

    detecting a transaction initiated by a second processor that requires data cached by the first processor, wherein the data is present in other locations than a cache of the first processor, and wherein a version of the data cached by the first processor is a most recent version;

    completing the transaction initiated by the second processor;

    writing back the most recent version; and

    reexecuting the transaction initiated by the second processor using the most recent version.

View all claims
  • 0 Assignments
Timeline View
Assignment View
    ×
    ×