i am taking atleast 5 to 6 min to run a single simulation us

Question

i am taking atleast 5 to 6 min to run a single simulation using ngspice for an inverter for nfet01v8 and pfet01v8 mosfet models can anyone say the reason please

Tom · Answer

It may be because ngspice is parsing all the models each time the simulation is run rather than just the ones it needs

Varun Majji · Answer

yeah i tried of including only corner tt spice and spice spm3 but some params are missing i am not understanding what all other files to include

Varun Majji · Answer

so i need directly call spice lib file which is including all spice model files of all components of tt corners

Varun Majji · Answer

please if there is anyway to include only the required component spice files can u tell me

Tom · Answer

I actually just include all of them and wait It shouldn t take that long How long is it taking

Varun Majji · Answer

like i was running spice lib file it took around 5 to 6 minutes

Stefan Schippers · Answer

Go into the pdk directory containing the `sky130 lib spice` file create a `sky130 tt lib spice` file with following content basically only the tt portion

Stefan Schippers · Answer

``` Typical corner tt lib tt MOSFET include cells nfet 01v8 sky130 fd pr nfet 01v8 tt corner spice include cells nfet 01v8 lvt sky130 fd pr nfet 01v8 lvt tt corner spice include cells pfet 01v8 sky130 fd pr pfet 01v8 tt corner spice include cells nfet 03v3 nvt sky130 fd pr nfet 03v3 nvt tt corner spice include cells nfet 05v0 nvt sky130 fd pr nfet 05v0 nvt tt corner spice include cells esd nfet 01v8 sky130 fd pr esd nfet 01v8 tt corner spice include cells pfet 01v8 lvt sky130 fd pr pfet 01v8 lvt tt corner spice include cells pfet 01v8 hvt sky130 fd pr pfet 01v8 hvt tt corner spice include cells esd pfet g5v0d10v5 sky130 fd pr esd pfet g5v0d10v5 tt corner spice include cells pfet g5v0d10v5 sky130 fd pr pfet g5v0d10v5 tt corner spice include cells pfet g5v0d16v0 sky130 fd pr pfet g5v0d16v0 tt corner spice include cells nfet g5v0d10v5 sky130 fd pr nfet g5v0d10v5 tt corner spice include cells nfet g5v0d16v0 sky130 fd pr nfet g5v0d16v0 tt discrete corner spice include cells esd nfet g5v0d10v5 sky130 fd pr esd nfet g5v0d10v5 tt corner spice include corners tt nonfet spice Mismatch parameters include cells nfet 01v8 sky130 fd pr nfet 01v8 mismatch corner spice include cells pfet 01v8 sky130 fd pr pfet 01v8 mismatch corner spice include cells nfet 01v8 lvt sky130 fd pr nfet 01v8 lvt mismatch corner spice include cells pfet 01v8 lvt sky130 fd pr pfet 01v8 lvt mismatch corner spice include cells pfet 01v8 hvt sky130 fd pr pfet 01v8 hvt mismatch corner spice include cells nfet g5v0d10v5 sky130 fd pr nfet g5v0d10v5 mismatch corner spice include cells pfet g5v0d10v5 sky130 fd pr pfet g5v0d10v5 mismatch corner spice include cells nfet 05v0 nvt sky130 fd pr nfet 05v0 nvt mismatch corner spice include cells nfet 03v3 nvt sky130 fd pr nfet 03v3 nvt mismatch corner spice Resistor Capacitor include r+c res typical cap typical spice include r+c res typical cap typical lin spice Special cells include corners tt specialized cells spice All models include all spice Corner include corners tt rf spice endl Slow Fast corner sf lib sf MOSFET include cells nfet 01v8 sky130 fd pr nfet 01v8 sf corner spice include cells nfet 01v8 lvt sky130 fd pr nfet 01v8 lvt sf corner spice include cells pfet 01v8 sky130 fd pr pfet 01v8 sf corner spice include cells nfet 03v3 nvt sky130 fd pr nfet 03v3 nvt sf corner spice include cells nfet 05v0 nvt sky130 fd pr nfet 05v0 nvt sf corner spice include cells esd nfet 01v8 sky130 fd pr esd nfet 01v8 sf corner spice include cells pfet 01v8 lvt sky130 fd pr pfet 01v8 lvt sf corner spice include cells pfet 01v8 hvt sky130 fd pr pfet 01v8 hvt sf corner spice include cells esd pfet g5v0d10v5 sky130 fd pr esd pfet g5v0d10v5 sf corner spice include cells pfet g5v0d10v5 sky130 fd pr pfet g5v0d10v5 sf corner spice include cells pfet g5v0d16v0 sky130 fd pr pfet g5v0d16v0 sf corner spice include cells nfet g5v0d10v5 sky130 fd pr nfet g5v0d10v5 sf corner spice include cells nfet g5v0d16v0 sky130 fd pr nfet g5v0d16v0 sf discrete corner spice include cells esd nfet g5v0d10v5 sky130 fd pr esd nfet g5v0d10v5 sf corner spice include corners sf nonfet spice Mismatch parameters include cells nfet 01v8 sky130 fd pr nfet 01v8 mismatch corner spice include cells pfet 01v8 sky130 fd pr pfet 01v8 mismatch corner spice include cells nfet 01v8 lvt sky130 fd pr nfet 01v8 lvt mismatch corner spice include cells pfet 01v8 lvt sky130 fd pr pfet 01v8 lvt mismatch corner spice include cells pfet 01v8 hvt sky130 fd pr pfet 01v8 hvt mismatch corner spice include cells nfet g5v0d10v5 sky130 fd pr nfet g5v0d10v5 mismatch corner spice include cells pfet g5v0d10v5 sky130 fd pr pfet g5v0d10v5 mismatch corner spice include cells nfet 05v0 nvt sky130 fd pr nfet 05v0 nvt mismatch corner spice include cells nfet 03v3 nvt sky130 fd pr nfet 03v3 nvt mismatch corner spice Resistor Capacitor include r+c res typical cap typical spice include r+c res typical cap typical lin spice Special cells include corners sf specialized cells spice All models include all spice Corner include corners sf rf spice endl```

Tim Edwards · Answer

< Stefan Schippers> So in spite of recent updates ngspice still has the problem of reading all of the models in the lib file and not just the one that is indicated on the lib line

Stefan Schippers · Answer

< Tim Edwards> I guess so if i don t need multi corner sims i just specify a lib file with one corner into it I have built pre master ngspice yesterday so let me give it another try

Tim Edwards · Answer

It was an unexpected feature of ngspice If it stays that way I really need to rework the sky130 lib spice file But it really really needs to be fixed in ngspice

Stefan Schippers · Answer

< Tim Edwards> I totally agree looks so simple and obvious a ` lib libfile tt` should parse only the ` lib tt endl` section full parsing the sky130 lib spice takes 1 15 on my system Parsing a cut down tt only lib file takes 15 so it is considerably faster

Tim Edwards · Answer

Trying to run a full ngspice simulation of the GPIO I O cell ngspice took something like ten minutes to start up