| CAUSE: | The Quartus II software ignored the specified number of CARRY_SUM primitives because they contain fan-out to logic that does not fit in a single logic cell. All fan-in logic in CARRY_SUM primitives must fit on a single logic cell. |
| ACTION: | Modify the design by moving the fan-out to the sum output of the CARRY_SUM primitive(s) or simplify the logic that the CARRY_SUM primitive(s) feed. |
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