One out of N checking apparatus and method

Details One out of N checking apparatus and method One out of N checking apparatus and method

1989-05-18

1991-11-19

Smith, Jerry

Excavating

H03M 1302

Patent

active

050671324

ABSTRACT:
A one out of N checking circuit for determining whether exactly one of N signal lines is active at any given time. The circuit includes a hierarchal structure of nodes which pairs the N signal lines together in a series of steps. Each node includes a par of output signal lines. The first signal line carries a signal representing whether an active signal line was "seen." The second signal line carries a signal representing whether an error has occurred, i.e. multiple active lines were seen. After each step, the number of signal lines is reduced by one-half until only two signal lines remain. At that point the two signal lines are compared and a final error signal is transmitted.

REFERENCES:
patent: 3428945 (1969-02-01), Toy
patent: 3744024 (1973-07-01), Russell et al.
patent: 4087786 (1978-05-01), Lescinsky et al.
patent: 4498177 (1985-02-01), Larson
patent: 4873686 (1989-10-01), Tada et al.

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