Electronic digital logic circuitry – Interface – Supply voltage level shifting
Patent
1998-02-04
2000-01-18
Tokar, Michael
Electronic digital logic circuitry
Interface
Supply voltage level shifting
326 39, 326 41, H03K 190175
Patent
active
060160632
ABSTRACT:
The present invention provides a method and apparatus for combining tristate buffers into wide logic functions. 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 long lines are used to implement wired logic functions, and the lines are then combined to implement wired logic functions wider than can be accommodated by a single long line. In one embodiment, each of the long lines is coupled to an input of a CLB to combine the portions of the logic function into a whole function using a function generator. In another embodiment, the wired logic portions are combined by cascading the long lines into the tristate inputs of another long line. In yet another embodiment, the long lines are cascaded into another line such as an edge decoder to form a logic function.
REFERENCES:
patent: 5140193 (1992-08-01), Freeman et al.
patent: 5677638 (1997-10-01), Young et al.
"The Programmable Logic Data Book", published Sep., 1996, available from Xilinx, Inc., 2100 Logic Drive, San Jose, California 95124, pp. 3-5 to 3-11 and 4-5 to 4-78.
Cartier Lois D.
Tokar Michael
Tran Anh
Xilinx , Inc.
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