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LEC - Conformal RTL to netlist mismatch

hnfq

Hi, I have now seen this issue with two different designs and have not been able to figure out the root cause for this behaviour.

I have synthesized a design using RTL Compiler and have generated both mapped and an optimized netlist.

1. When I compare the RTL to mapped netlist (non-hierarchical comparison), I don't see any non-equivalent points.

2. When I compare the mapped netlist to the final optimized netlist, I don't see any non-equivalent points.

3. But when I compare RTL to final optimized netlist, I get non-equivalent points.

Looking into this matter in detail, I noticed that these non-equivalent points start showing up as soon as I run the first incremental synthesis on the mapped netlist.

Any ideas as to why the RTL to final netlist comparison are showing non-equivalencies?

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