Data processing systems

Details Data processing systems Data processing systems

1983-05-18

1985-03-26

Atkinson, Charles E.

Excavating

371 3, G06F 1100

Patent

active

045077843

ABSTRACT:
A data processing system consists of a number of modules such as integrated circuit chips, each of which receives a clock signal. Each module contains a checking circuit producing a failure signal which indicates whether or not the module is operating correctly. The clock signal is used to invert the sense of this failure signal in successive clock periods. Thus, the failure signal normally alternates between two values in successive clock periods, and its phase relative to the clock signal denotes whether or not a failure has been detected. However, if the clock supply to a module fails, or if the checking circuit itself fails, the failure signal from that module no longer alternates, but is frozen at one or other of the two values. This allows failure of the clock supply or of the checking circuit to be detected.

REFERENCES:
patent: 4081662 (1978-03-01), Pehrson et al.
patent: 4122441 (1978-10-01), Robinson et al.
patent: 4144448 (1979-03-01), Pisciotta et al.
patent: 4328583 (1982-05-01), Stodola
patent: 4342112 (1982-07-01), Stodola
patent: 4392226 (1983-07-01), Cook
patent: 4468768 (1984-08-01), Sunkle et al.

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