Self-checking computer circuitry

Details Self-checking computer circuitry Self-checking computer circuitry

1983-03-21

1985-09-10

Smith, Jerry

Excavating

364200, G06F 1116

Patent

active

045410941

ABSTRACT:
Circuitry for a fault-tolerant computer is disclosed which circuitry is constructed in two identical halves. Each half, by itself, is not a functionally-complete circuit, however, the two identical halves can be connected together to provide a functionally-complete circuit. Each of the two circuit halves is considerably less complex than a functionally-complete circuit yet, when connected together, the two halves provide fault detection capabilities equivalent to a computer system in which the outputs of two functionally-complete, redundant circuits are compared to detect faults.
In particular, each inventive circuit half contains a complete data processing and control unit but only one half of the memory which is necessary for a functionally-complete unit. The processing units on each circuit half operate simultaneously on identical data and the same address information is provided to the memories on each circuit half.
To provide error detection, address information and data sent from each control unit to its associated memory is compared between circuit halves. In addition, information provided to the circuits over an external bus or generated by the control unit is encoded with an error-detecting code.

REFERENCES:
patent: 3476922 (1969-11-01), Yiotis
patent: 4032757 (1977-06-01), Eccles
patent: 4253144 (1981-02-01), Bellamy et al.
patent: 4358823 (1982-11-01), McDonald et al.
patent: 4453215 (1984-06-01), Reid

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