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US 7,030,650 B1Granted
Fracturable incomplete look up table area efficient logic elements
AssigneeAltera Corporation
InventorsSinan Kaptanoglu, David Lewis, Bruce Pedersen
Life of this patent
Estimating the term…
Abstract
Disclosed is a configurable logic circuit that includes at least 6 inputs and at least two outputs. The configurable logic element can carry out only a subset of all 6-input logic functions and, thus, requires a substantially smaller silicon area than a 6-LUT that can perform all 6-input logic functions. Also, the configurable logic circuit can be configured such that a first subset of the inputs drive one of the outputs and a second subset of the inputs drive another output.
Claims25
A configurable logic circuit comprising:
- at least 6 inputs;
- at least a first output and a second output;
- no more than 63 memory bits which are programmable to completely configure the logic function performed by the configurable logic circuit;
- and
- wherein the configurable logic circuit can be configured such that
- the at least 6 inputs drive the first output to generate a 6 input logic function;
- and
- the configurable logic circuit can also be separately configured such that a first subset of the at least 6 inputs drives the first output and a second subset of the at least 6 inputs drives the second output.
5 more elements
A configurable logic circuit comprising:
- at least 6 inputs;
- at least a first output and a second output;
- 3 complete 3-LUTs;
- and
- wherein the configurable logic circuit can be configured such that the at least 6 inputs drive the first output to generate a 6 input logic function;
- and the configurable logic circuit can also be separately configured such that a first subset of the at least 6 inputs drives the first output and a second subset of the at least 6 inputs drives the second output.
3 more elements
A configurable logic circuit comprising:
- at least 6 inputs;
- at least a first output and a second output;
- no more than 25 memory bits which are programmable to completely configure the logic function performed by the configurable logic circuit;
- and
- wherein the configurable logic circuit can be configured such that one of either;
- the at least 6 inputs drive the first output to generate a 6 input logic function;
- and
- a first subset of the at least 6 inputs drives the first output and a second subset of the at least 6 inputs drives the second output.
5 more elements
Dependencies are inferred from the claim text.