Electronic digital logic circuitry – Multifunctional or programmable
Patent
1999-05-14
2000-07-25
Nelms, David
Electronic digital logic circuitry
Multifunctional or programmable
326 39, H03K 19173
Patent
active
060940638
ABSTRACT:
The present invention provides an apparatus for converting logic signals of a first voltage level to logic signals of a second voltage level in response to a control signal indicative of whether logic signals on an associated target device are of the first or second voltage level. An output configuration includes a de-multiplexer having an input terminal coupled to receive an output signal of an associated logic circuit, a control terminal coupled to receive a control signal, and first and second output terminals, the first de-multiplexer output terminal being connected to the target device. A switch coupled between the second de-multiplexer output terminal and the target device has a control terminal coupled to receive the control signal. When the control signal is in a first state, a voltage drop across the switch converts the logic signals of the first voltage level to logic signals of the second voltage level. When the control signal is in a second state, the switch is not conductive, and the logic signals of the associated logic circuit are provided directly to the target device.
REFERENCES:
patent: Re34363 (1993-08-01), Freeman
patent: 5430687 (1995-07-01), Hung et al.
patent: 5844829 (1998-12-01), Freidin et al.
patent: 6020757 (2000-02-01), Jenkins, IV
"The Programmable Logic Data Book", 1998, available from Xilinx Inc., 2100 Logic Drive, San Jose, California, 95124.
St. Pierre, Jr. Donald H.
Theron Conrad A.
Lam David
Nelms David
Paradice William L.
Xilinx , Inc.
Young Edel M.
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