Electronic digital logic circuitry – Multifunctional or programmable – Array
Patent
1999-02-04
2000-11-28
Tokar, Michael
Electronic digital logic circuitry
Multifunctional or programmable
Array
326 38, H03K 19177
Patent
active
061540528
ABSTRACT:
In an FPGA having a tristate bus structure formed by a multiplexer chain extending across a plurality of logic units, a programmable function generator is provided to interface between the input and enable signal lines of logic units and the corresponding multiplexer's input and control terminals and is coupled to receive a mode control signal. When the mode control signal is in a first logic state, the function generator couples the input and enable signals to the corresponding multiplexer input and control terminals to emulate a tristate input bus. When the mode control signal is in a second logic state, the function generator receives first and second data signals from corresponding input and enable lines. In response thereto, the function generator couples one of the data signals to the corresponding multiplexer input terminal and provides an exclusive-OR logic function of the first and second data signals to the corresponding multiplexer control terminal. In this manner, each multiplexer stage provides a carry signal to the next multiplexer stage, thereby forming a carry path in the horizontal direction across the FPGA.
REFERENCES:
patent: Re34363 (1993-08-01), Freeman et al.
patent: 5349250 (1994-09-01), New
patent: 5365125 (1994-11-01), Goetting et al.
patent: 5546018 (1996-08-01), New et al.
patent: 5629886 (1997-05-01), New
patent: 5675262 (1997-10-01), Duong et al.
patent: 5677638 (1997-10-01), Young et al.
Cartier Lois D.
Le Don Phu
Paradice, Esq. William L.
Tokar Michael
Xilinx , Inc.
LandOfFree
Combined tristate/carry logic mechanism does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Combined tristate/carry logic mechanism, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Combined tristate/carry logic mechanism will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1729445