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If you know the ASIC word, as you mentioned , you understand the row is not define and the tool cannot place any std cell...
Read the documentation and start by doing a simple synthesis to then place this netlist... and the following steps.
1- importing SPEF, will just confirm the sign-off STA inside innovus (tempus call in background). Personally I prefer to do that inside a sign-off timing engine (tempus or primetime), also depend of the foundry which sign-off STA is "approved".
2- in any case, adapting the RC scale factor is...
right
using Innovus with high extraction accuracy increased the runtime, so the trade off is to update the R/C factor to be close with less run time penality.
The "signoff" innovus extraction can be used to do a pre-eco hold/setup, but I always prefer to used the ECO given by PT into innovus...
StarRC has a flow you can provide the netlist as input, no need of v2lvs.
first question, from the foundry which RC tool is signoff?
This signoff-spef should be used to provide the factor versus the Quantus-Innovus extraction tool (no the signoff one) to adapt the R/C calibration factor.
as rise by ThisIsNotSam, LEC is here to validate the netlist post synthesis is identical to the RTL, never rely only on the TB.
Both post synthesis netlist (with any option if both RTL are identical) must be LEC, if not, contact Synopsys.
StarRC can also read the netlist verilog, no need to go through the v2lvs flow.
It's also good to correlate the innovus spef versus the StarRC spef with osctrich for example which will give the R/C correction factor to use in Innovus while RC view are read in the mmmc.
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