Electronic digital logic circuitry – Multifunctional or programmable – Array
Patent
1998-02-04
1999-10-26
Tokar, Michael
Electronic digital logic circuitry
Multifunctional or programmable
Array
326 37, 327407, G06F 738
Patent
active
059735066
ABSTRACT:
The present invention provides a method and apparatus for combining tristate buffers into busses with a large number of drivers. The invention provides for an arbitrary number of drivers to be accommodated on a single line in a circuit wherein the number of tristate buffers coupled to the line is limited. A plurality of lines are used to support the required number of tristate buffers, and a multiplexing circuit is used to select the active line. Tristate control signals for the tristate buffers are utilized to generate the requisite multiplexer select signals. In one embodiment, the multiplexing function and the select signal generation logic are implemented in configurable logic blocks. In another embodiment, wired logic functions perform the select signal generation, and a cascade configuration of tristate buffer driven lines performs the multiplexing function.
REFERENCES:
patent: 5140193 (1992-08-01), Freeman
patent: 5677638 (1997-10-01), Young et al.
"The Programmable Logic Data Book", published Sep., 1996, available from Xilinx, Inc., 2100 Logic Driv, San Jose, California 95124, pp. 3-5 to 3-11, 4-5 to 4-78.
Cartier Lois D.
Tokar Michael
Tran Anil Q.
Xilinx , Inc.
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