The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 18, 2001
Filed:
Feb. 16, 2000
Bernard J. New, Los Gatos, CA (US);
Richard A. Carberry, Los Gatos, CA (US);
Xilinx Inc., San Jose, CA (US);
Abstract
A programmable logic device (PLD) includes at least one function generator capable of implementing any arbitrarily defined Boolean function of input signals. The PLD includes a dynamically controlled multiplexer (MUX) on each function-generator input terminal. The inputs of each MUX can be routed to the corresponding function-generator input terminal by providing an appropriate select signal on one or more control lines. One embodiment of the PLD includes a programmable look-up table (LUT) that permits routing software to determine the correspondence between the MUX input terminals and a user-defined selection code on the MUX select lines. In one embodiment, the correspondence between the NUX input terminals and the selection code is established by configuring a number of programmable memory cells in the LUT. Another embodiment enhances programming flexibility with an additional MUX connected between the control lines and the LUT. This control MUX allows a user to determine which control lines will provide input signals to the function generator.