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There are several possible reasons why the intended edit can't be implemented:
- the logic function coded in the LUT mask is referring to unconnected inputs
- you're trying to route signals to LUT inputs that can't be driven by them due to routing restrictions
The error message seams to support the first assumption.
What are you trying to achieve?
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Thanks for you reply!
For example, assume that i want to implement a single bit adder (two input). So only single LE or ALM is enough for it. There are at least 8 inputs for ALM which can be used as the adder's two inputs. I want to test the output of the adder when the adder's inputs come into the ALUT through different inputs of the ALUT. The source modification can't approach it, i think ECO may approach it. So I try to modify the input of the adder and examine the output results. There are several possibilities of the adder's inputs come into the ALUT. What's i want is to approach every possibility and test them.
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