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?
No, there wasn't any particular reason for running flat comparison. I just wanted to make sure that whether I run hierarchical or flat comparison I would be able to rely on the final result.
Appreciate your input on this issue. Thanks.