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Why def file is needed apart from gds file for starrcxt?

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gstekboy

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Why def file is using along with gds file during spef generation using starrc?
 

ThisIsNotSam

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starrc runs LVS prior to extraction, so it needs to a reference to compare against and to know where to annotate things. It needs some form of netlist.
 

gstekboy

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starrc runs LVS prior to extraction, so it needs to a reference to compare against and to know where to annotate things. It needs some form of netlist.

For that .v.lvs (verilog netlist with pg) can be used, why .def?

Also if sub macro is present in block , starrc asking for .lef file of that submacro (frame.lef) , why?
 

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