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Logical, fail-functional, dual central processor units formed from three processor units

  • US 5,838,894 A
  • Filed: 06/07/1995
  • Issued: 11/17/1998
  • Est. Priority Date: 12/17/1992
  • Status: Expired due to Term
First Claim
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1. A fault tolerant processing system, comprising:

  • a first central processing unit comprising a pair of first processor devices operating to execute each instruction of an instruction stream at substantially the same moment in time;

    a second central processing unit comprising a second processor device operating to execute each instruction of substantially an identical copy of the instruction stream, the pair of first processor devices and the second processor device executing identical instructions of the instruction stream and the identical copy of the instruction stream at substantially the same moment in time;

    whereby the first and second central processing units operate in synchronism to perform substantially the same operations at substantially the same moments in time, including providing output data; and

    a data checking element connected to receive and compare the output data from the first and second central processing units, and selectively outputting the output data from the first or the second central processing unit;

    wherein said first and second central processing units operate in error-checking redundancy, duplexed pair.

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