Null convention logic gates with flash, set and reset capability

Details Null convention logic gates with flash, set and reset capability Null convention logic gates with flash, set and reset capability

1998-01-08

2000-03-28

Tokar, Michael

Electronic digital logic circuitry

Threshold

326 35, 326 98, 326 17, H03K 1923, H03K 19096, H03K 1901

Patent

active

060436743

ABSTRACT:
Threshold logic gates are disclosed that respond to signals that may assume at least a first state having an arithmetic or logic meaning, and a second NULL state that has no arithmetic or logic meaning. Threshold values may be equal to or less than the number of input signal lines. Threshold gates switch their outputs from NULL to a meaningful state when the threshold number of inputs assume meaningful states. Gates will hold outputs in a meaningful (or non-null) state when the number of asserted inputs remains positive, even if the number is less than the threshold. In one embodiment, threshold gates include a "FLASH" input that forces the gate to NULL. In another embodiment, threshold gates include one or more "SET" inputs that drive the gate output to NULL or to a meaningfull state.

REFERENCES:
patent: 4700086 (1987-10-01), Ling et al.
patent: 5258666 (1993-11-01), Furuki
patent: 5440243 (1995-08-01), Lyon
patent: 5612638 (1997-03-01), Lev
patent: 5828234 (1998-10-01), Sprague
patent: 5841300 (1998-11-01), Murabayashi et al.

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