Hi, when I used netgen tool for LVS, it can work for flatten netlists. However, it can not work for hierarchical netlists, as shown . How I can fix it?, can you give me some tips?. I hope my question is clear

how it supposed to know which cells to compare. The arguments need to look like: nelist_name subckt_name

@Ahmed Reda: For the hierarchical case, use the syntax

lvs "<file1_name> <subckt_name>" "<file2_name> <subckt_name>" [<options>]

. If you just provide a file name, then netgen sees subcircuits but does not see those subcircuits instantiated anywhere, and so its understanding is that it is looking at a library of subcircuit components and not a netlist. You have to tell it what subcircuit is to be considered the top level of the design.

Thanks. It is Ok.