i am taking atleast 5 to 6 min to run a single simulation us open-source-silicon.dev #analog-design

i am taking atleast 5 to 6 min to run a single sim...

Varun Majji

02/11/2021, 7:44 PM

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

02/12/2021, 1:12 AM

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

02/12/2021, 3:00 AM

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

02/12/2021, 3:00 AM

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

Varun Majji

02/12/2021, 3:07 AM

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

Tom

02/12/2021, 4:52 AM

I actually just include all of them and wait. It shouldn't take that long. How long is it taking?

Varun Majji

02/12/2021, 5:16 AM

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

Stefan Schippers

02/12/2021, 2:01 PM

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

02/12/2021, 2:01 PM

Copy code

* 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

Stefan Schippers

02/12/2021, 2:01 PM

message has been deleted

Tim Edwards

02/12/2021, 2:12 PM

@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

02/12/2021, 2:16 PM

@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

02/12/2021, 2:18 PM

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

02/12/2021, 2:23 PM

@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

02/12/2021, 2:24 PM

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

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