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Two lane computing systems

  • US 5,581,739 A
  • Filed: 07/26/1994
  • Issued: 12/03/1996
  • Est. Priority Date: 10/10/1991
  • Status: Expired due to Fees
First Claim
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1. A computing system comprising:

  • two lanes, each lane having at least one processing means, the lanes being arranged to produce respective, nominally-identical outputs;

    means for supplying input data to each lane;

    means for detecting a discrepancy between said outputs and signalling a fault;

    store means associated with each said processing means, said store means being arranged to store input data supplied to its respective processing means and to re-inject input data to its respective processing means if the system should be restarted following an interruption to the system;

    simulator means for simulating operation of said processing means of one of the lanes on detection of a discrepancy between the outputs from said lanes;

    means for supplying the simulator means with said input data stored in said store means of one of the lanes which was supplied to its associated processing means just prior to the detection of a discrepancy, said simulator means being arranged to simulate the operation of the processing means of said one lane utilizing the data from said store means supplied to the store means just prior to detection of the discrepancy; and

    means for comparing an output of the simulator means with the outputs of the lanes produced on detection of the discrepancy so as thereby to identify which of said lanes is a malfunctioning lane.

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