Programmable logic circuit using wired-or tristate gates

Details Programmable logic circuit using wired-or tristate gates Programmable logic circuit using wired-or tristate gates

1990-02-16

1991-06-25

Hudspeth, David

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307469, 307473, H03K 19094

Patent

active

050270125

ABSTRACT:
A programmable logic circuit for deriving a logic output of first and second signals includes a 2-input logic gate for deriving a logic output of two signals. The 2-input logic gate is constituted by connecting two 3-state circuits in a wired OR configuration. One of the 3-state circuits includes a data input terminal, output control input terminal, and data output terminal, the output control input terminal receives an inverted signal of the second signal, and the data output terminal is set to one of three states of "1", "0", and the high impedance. Likewise, the other 3-state circuit includes a data input terminal, output control input terminal, and data output terminal, the output control input terminal receives the second signal, and the data output terminal is set to one of three states of "1", "0", and the high impedance. Each of the data input terminals of the 3-state circuits is supplied with a desired one of the first signal, an inverted signal of the first signal, a "0" level signal, and a "1" level signal in a programmable fashion. Various logic gates can be realized by programming the supplying states of the four signals.

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