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Processing board, a computer, and a fault recovery method for the computer

  • US 5,812,757 A
  • Filed: 07/05/1996
  • Issued: 09/22/1998
  • Est. Priority Date: 10/08/1993
  • Status: Expired due to Fees
First Claim
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1. A processing board including a clock signal, the processing board for connecting to at least one system bus, the processing board comprising:

  • a single clock circuit supplying the clock signal;

    at least three processing units, each processing unit connected to receive the clock signal and operating synchronous with the clock signal, each processing unit receiving and executing same instructions, each processing unit including a processor and each processing unit including a cache memory coupled to the processor of the processing unit, each processing unit having an output signal carrying outputs from the processor and the cache memory;

    a majority unit having an input connected to each processing unit and an output connected to the system bus that receives the output signal from each processing unit, and provides a selected output signal to the system bus, the majority unit further having a control register connected to receive the selected output signal and to be written thereby with a value controlling connection status, isolation status and interrupt status for all of the processing units; and

    a processor bus connecting each processing unit to the majority unit;

    wherein all elements are included on a single processing board.

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