Hi All, after i tried to fix the above error, I end up with the following error when tried to simulate the rearm cell. Error on line 5 or its substitute: n1 top 0 sky130_fd_pr_reram__reram_model could not find a valid modelname Simulation interrupted due to error!. why it cant recognize the reram model?

@Tim Edwards @Stefan Schippers The device model extracted in magic is

sky130_fd_pr__reram_reram_cell

. Looks like the xschem model is

sky130_fd_pr_reram__reram_model

. Should these be the same?

@Mitch Bailey (cc @Tim Edwards) Since today (after fixes made by @Barak Hoffer, Thank you!) the reram symbol calls

sky130_fd_pr_reram__reram_cell

I have committed the changes in xschem_sky130, an open_pdks update/reinstall will pull in the updated xschem device. The verilog-A patched model should be included in open-pdks in some way, and needs to be compiled by

openvaf

on the target platform. The reram symbol is now netlisted as a subcircuit. Barak has built a wrapper that instantiates the verilog-A model.

XR1 TOP 0 sky130_fd_pr_reram__reram_cell Tfilament_0=3.8e-9

The subcircuit contains the actual verilog-A primitive limked to a

sky130_fd_pr_reram__reram_model

model.

.subckt sky130_fd_pr_reram__reram_cell TE BE Tfilament_0=3.3e-9 area_ox=0.1024e-12

N1 TE BE nFilament sky130_fd_pr_reram__reram_model

.ic v(nFilament)={Tfilament_0*1.0e9}

.ends sky130_fd_pr_reram__reram_cell

The xschem

reram.sym

is self contained. When one or more of these devices are present in a circuit the following lines will be present in the netlist. The path for the osdi compiled model is built using the PDK_ROOT variable (should point to the the sky130B process variant)

.subckt sky130_fd_pr_reram__reram_cell TE BE Tfilament_0=3.3e-9 area_ox=0.1024e-12
N1 TE BE nFilament sky130_fd_pr_reram__reram_model
.ic v(nFilament)={Tfilament_0*1.0e9}
.ends sky130_fd_pr_reram__reram_cell

.model sky130_fd_pr_reram__reram_model sky130_fd_pr_reram__reram_module area_ox=0.1024e-12  area_ox
+ = 0.1024e-12  Tox = 5.0  Tfilament_max = 4.9  Tfilament_min = 3.3  Eact_generation = 1.501
+  Eact_recombination  = 1.500  I_k1  = 6.140e-5  Tfilament_ref = 4.7249  V_ref = 0.430  velocity_k1 = 150  gamma_k0  =
+ 16.5  gamma_k1  = -1.25  Temperature_0 = 300  C_thermal = 3.1825e-16  tau_thermal = 0.23e-9  t_step  =
+ 1.0e-9  smoothing = 1e-7  Kclip = 200

.control
pre_osdi /home/schippes/share/pdk/sky130B/libs.tech/ngspice/sky130_fd_pr_reram__reram_module.osdi
.endc