Electronic digital logic circuitry – Exclusive function – With field-effect transistor
Patent
1995-06-30
1996-10-22
Westin, Edward P.
Electronic digital logic circuitry
Exclusive function
With field-effect transistor
326 45, 326 54, H03K 19094, H03K 1921
Patent
active
055680674
ABSTRACT:
A configurable XNOR/XOR logic element is used, in an exemplary embodiment, in an array of spare gates included in a processor or other integrated circuit. The XNOR/XOR logic element (FIG. 4, 60) is configurable as either an XNOR or an XOR gate by a C (configuration) input (that can be metal configurable as either asserted or deasserted). Inverted and noninverted C inputs control two coupling circuits: (a) coupling circuit C10 includes p-transistors C11, C12, C13, and C14, and (b) coupling circuit C20 includes n-transistors C21, C22, C23, and C24. Depending on whether the C input is deasserted or asserted (and the inverted C input is correspondingly asserted or deasserted), these configuration transistors series or cross couple parallel stacked p- and n-transistors that receive inverted and noninverted A and B inputs to effect the selected configuration. Specifically, deasserting C provides the XOR configuration, while asserting C provides the XNOR configuration. In an alternative embodiment, the XNOR/XOR logic element can be used in a full adder to provide the sum output.
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McDermott Mark W.
Turner John E.
Cyrix Corporation
Maxin John L.
Roseen Richard
Viger Andrew S.
Westin Edward P.
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