| CAUSE: | The Quartus II software ignored the specified number of CARRY_SUM primitives because there are not enough LUT inputs in the logic cell. The current design requires more fan-in to the LUT inputs in the logic cell than can be implemented in the logic cell. |
| ACTION: | Check the fan-in to the logic feeding the CARRY_SUM primitive and modify the design by removing LUT inputs to the logic cell, or by modifying the fan-in to the logic cell so it can share more signals. |
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