Method and apparatus of checking to determine if a signal is pre

Details Method and apparatus of checking to determine if a signal is pre Method and apparatus of checking to determine if a signal is pre

1975-11-13

1977-04-26

Atkinson, Charles E.

Communications: electrical

Digital comparator systems

235153AE, 3401461BE, G06F 1100, H03K 1332

Patent

active

040204600

ABSTRACT:
This specification describes an apparatus for determining if more than one of n lines are up at a given time. The apparatus includes means for encoding the n lines into m lines where n = 2.sup.m. Two encoding signals are generated; one, X.sub.0 X.sub.1 . . . X.sub.m, complement of the other, Z.sub.0 Z.sub.1 . . . Z.sub.m. These two signals are Ex OR'd in accordance with the formula (X.sub.0 Z.sub.0) .sup.. (X.sub.1 Z.sub.1) . . . (X.sub.m Z.sub.m). If more than one line is up, the resultant of the Ex OR operation is one. Otherwise the resultant is zero.

REFERENCES:
patent: 2973506 (1961-02-01), Newby
patent: 3541507 (1970-11-01), Duke
patent: 3559167 (1971-01-01), Carter et al.
patent: 3585637 (1971-06-01), Jones et al.
patent: 3638184 (1972-01-01), Beuscher et al.
patent: 3891143 (1975-06-01), Haeusler
Sellers et al., Error Detecting Logic for Digital Computers, McGraw-Hill Book Co., 1968, pp. 176, 177, 207-218.

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