QRC & Cap table

Cap table is a less accurate table for Capacitance values. It will have a basic and extended cap tables for all capacitances such as Coupling, Fringe and Area Capacitances.

QRC.tech is a binary file which will have accurate characterization of the library elements.


If you're doing MMMC, then your analysis views were set up with the create_analysis_view command which included a -delay_corner option. The delay corners are setup up with the create_delay_corner command which has a -rc_corner option. Finally, the create_rc_corner command is what points to the QRC tech files:

create_rc_corner -name worst \
-cap_table "worst.CapTbl" \
-T 125 \
-qx_tech_file "worst.tch"

Having said that, extractRC is the built-in FE extraction which uses cap tables. If you want to use QRC for extraction, you'll need to use runQRC. QRC will then be run for all corners referenced by your active views.

So, just make sure you've got everything set up correctly in your MMMC commands, and you're good to go! (When using MMMC, it's the data in the MMMC commands that matters, not what's in the .conf file.)