Fast primary and feedback path in a programmable logic circuit

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3642383, 3642295, 3642389, 3642381, 3642405, 364242, 3642412, 3642436, 3642449, 364DIG1, 364DIG2, G06F 932, G06F 946, G06F 1318, G06F 1338

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053794427

ABSTRACT:
A plurality of programmable circuits joining input terminals to output terminals in a product term of a programmable logic circuit. Each circuit includes a first multiplexor joining an input terminal to a first node, a second multiplexor joining an output terminal to the first node, and a source of signals of a first value. Further included is a first apparatus for selecting whether to transfer signals either from the first and second multiplexors or from the source of signals of the first value to the first node, and a second apparatus for selecting whether to transfer signals either from the first multiplexor or the second multiplexor to the first node A third apparatus determines whether a third multiplexor selects either the signal at the first node for transfer to the output terminal or the inverse of the signal at the first node for transfer to the output terminal.

REFERENCES:
patent: 4701842 (1987-10-01), Olnowich
patent: 4837676 (1989-06-01), Rosman
patent: 4876640 (1989-10-01), Shanka et al.
patent: 4930097 (1990-05-01), Ledenbach et al.
patent: 5121473 (1992-06-01), Hodges
patent: 5142630 (1992-08-01), Ishikawa

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