@User if you full install open_pdks you now have two process variants: .../share/pdk/sky130A and .../share/pdk/sky130B. The latter one includes reram support. For xschem all i do is to handle the reram device and producing the following netlist:

** sch_path: /home/schippes/.xschem/xschem_library/xschem_sky130/sky130_tests/test_reram.sch
**.subckt test_reram
Y1 BE TE rram2_model m=1
**.ends
**** begin user architecture code
.model rram2_model rram2 rram2_params.scs
**** end user architecture code
.end

based on the example i found here... for simulating this some Verilog-AMS expert must step in and give some advice.

Thanks for the reply and your intention to help, but it doesn't serve the purpose. really need input from an experienced user.