Logic circuit having a control signal switching logic function a

Details Logic circuit having a control signal switching logic function a Logic circuit having a control signal switching logic function a

1993-10-21

1996-12-24

Beausoliel, Jr., Robert W.

Excavating

G06F 1100

Patent

active

055880061

ABSTRACT:
A logic circuit for a built-in self test or for a built-in logic block observer responds to at least first and second input signals and control signals. The circuit includes a first circuit with two outputs, one for always outputting the second input signal, and the other for outputting the second input signal and the inverse value thereof according to a first control signal, a second circuit for selecting and outputting one of the two outputs of the first circuit according to the first input signal, then outputting an exclusive OR value or an exclusive NOR value of the first input signal and the second input signal, and a third circuit for providing a third input signal or a fixed value as a second input signal to the first circuit according to a second control signal. The inversion functions for obtaining an adequate polarity of signals employing clocked inverters, or transfer gates and an inverter. The logic functions also employ cascaded flip-flop circuits and a linear feedback shift register.

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patent: 5184067 (1993-02-01), Nozuyama
patent: 5189675 (1993-02-01), Nozuyama et al.

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