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Design A has 36AND 96XOR , consumed 82 LE, while
design B has 35AND 120XOR, consumed 79 LE
i think it will be odd to report a result as such in my work.
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LE elements your project requires are mostly related to HOW they are connected, not only to the number of logic gates you use in the design.
For example, a long AND/XOR chain could be synthesized in a few LE, if the resulting logic function can be simplified.
On the other hand, if a gate output must drive a lot of input gates, the compiler may replicate it on more than one LE to meet the high fan out requirement.
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