Trinary signal apparatus and method

Details Trinary signal apparatus and method Trinary signal apparatus and method

1997-05-22

1999-06-15

Santamauro, Jon

Electronic digital logic circuitry

Three or more active levels

With conversion

326 62, H03K 1900

Patent

active

059125632

ABSTRACT:
Extended trinary signal apparatus includes window comparator logic having first and second inputs for first and second trinary input signals, wherein each the trinary input signal can be a high, low or mid state, and an output for outputting signals dependent on the states of the first and second trinary input signals. A switch, which is connected to one of the first and second inputs, can be selectively activated in one phase to set the one of the first and second inputs to a state other than the mid state and can be inactive in another phase. Control logic is responsive to output signals from the window comparator output during the one and the other phase to provide extended trinary decoding of the trinary input signals. In this manner ninth and tenth input combinations can be identified by detecting whether two inputs which show a mid state are electrically connected to each other or not, this being achieved by selectively pulling one of the inputs to a predetermined state and determining whether the other input follows or not. Trinary encoding can thus be extended to provide ten, rather than the conventional nine states from two inputs.

REFERENCES:
patent: 4100429 (1978-07-01), Adachi
patent: 4465944 (1984-08-01), Shin
patent: 4631428 (1986-12-01), Grimes
patent: 5714892 (1998-02-01), Bowers et al.

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