Logic gates with a programmable number of inputs

Details Logic gates with a programmable number of inputs Logic gates with a programmable number of inputs

1989-05-12

1991-04-30

Hudspeth, David

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

3072021, 307448, 307451, 307469, 307471, H03K 19094

Patent

active

050121359

ABSTRACT:
Apparatus for programming an OR gate, an AND gate or an EXCLUSIVE-OR gate to accept or not accept an input signal at an input terminal of the gate. The apparatus includes two pass transistors, a source of high or low voltage depending on the gate to be programmed, and a control signal that is used for programming the gates of the pass transistors. The two pass transistors may be of the same channel type i.e.,. both n-channel or both p-channel, or they may be of opposite channel types. This apparatus provides positive input signals from a group of input signals to avoid voltage signal ambiguities in programming the gates. Use of these programmable gates in combination in an AND-OR array is illustrated.

REFERENCES:
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patent: 4233524 (1980-11-01), Burdick
patent: 4495427 (1985-01-01), Cartwright, Jr.
patent: 4558236 (1985-12-01), Burrows
patent: 4600846 (1986-07-01), Burrows
patent: 4642487 (1987-02-01), Carter
patent: 4761570 (1988-08-01), Williams
Brickman et al., "Programmable Logic Array Logic Enhancement", IBM T.D.B., vol. 19, No. 2, Jul. 1976, p. 583.
Robinson, Byte Magazine, Jan. 1987, pp. 197-203.
Coli, Byte Magazine, Jan. 1987, pp. 207-219.
Electronics Magazine, Sep. 17, 1987, pp. 65-72.
Ikawa, IEEE Journal of Solid-State Physics, vol. sc-21, Apr. 1986, pp. 223-227.

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