Electronic digital logic circuitry – Multifunctional or programmable – Field-effect transistor
Patent
1995-06-30
1997-01-07
Westin, Edward P.
Electronic digital logic circuitry
Multifunctional or programmable
Field-effect transistor
326 50, 326121, H03K 190948
Patent
active
055921078
ABSTRACT:
A configurable NAND/NOR logic element is used, in an exemplary embodiment, in an array of spare gates included in a processor or other integrated circuit. The NAND/NOR logic element (FIG. 3, 50) is configurable as either a NAND or a NOR gate by a C (configuration) input (that can be metal configurable as either asserted or deasserted). C inputs control p- and n-channel transistors. Depending on whether the C input is deasserted or asserted, respective internal nodes are shorted to effect the selected configuration. Specifically, deasserting C provides the NAND configuration, while asserting C provides the NOR configuration. In an alternative embodiment, the NAND/NOR logic element can be used in a full adder to provide the carry output.
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patent: 4233524 (1980-11-01), Burdick
patent: 4609830 (1986-09-01), Brandman
patent: 4785199 (1988-11-01), Kolodny et al.
patent: 4968903 (1990-11-01), Smith et al.
McDermott Mark W.
Turner John E.
Cyrix Corporation
Driscoll Benjamin D.
Maxin John L.
Viger Andrew S.
Westin Edward P.
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