Please, how can I install or add model files in "xschem" library ? tt_models.sym ff_models.sym ss_models.sym fs_models.sym sf_models.sym

I told you to post here before noticing that you had already posted here. : ) Please see my response in the #sky130 channel.

Thank u

hi

That looks like the right symbol, but in my open_pdks installation, the properties look like this:

name=TT_MODELS
only_toplevel=true
format="tcleval( @value )"
value="** manual skywater pdks install (with patches applied)
* .lib \\$::SKYWATER_MODELS\\/models/sky130.lib.spice tt

** opencircuitdesign pdks install
.lib \\$::SKYWATER_MODELS\\/sky130.lib.spice tt

.param mc_mm_switch=0
.param mc_pr_switch=0
"
spice_ignore=false

okay, I will try to simulate using it and see Thank u :)

You can also just edit the block and change

.lib

to

".lib /usr/share/pdk/sky130A/libs.tech/ngspice/sky130.lib.spice tt"

(be sure to add quotes, since the expression has spaces in it). In the above, the

format=

line is needed because the expression is using a Tcl variable name that needs to be evaluated, and the

.param

statements are not needed. I don't know if the

spice_ignore=

line is needed or not.

@Soliman Mohammad In the xschem_sky130 examples i am gradually removing all these tt_models and using the standard way of specifying corners, this is done with a

.lib /path/to/sky130.lib.spice tt

changing simulation corner is achieved simply by changing the last 2 letters:

.lib /path/to/sky130.lib.spice ff

The location of the ngspice lib file depends on your open_pdks installation but should be something like:

.../share/pdk/sky130A/libs.tech/ngspice/sky130.lib.spice

Instead of specifying the actual path for the lib file installation i am using a tcl variable, set in the xschemrc (look at the bottom of this file), so the 'value' attribute of the code.sym symbol is:

.lib \$::SKYWATER_MODELS\/sky130.lib.spice tt

The backslash before '$' tells xschem not to interpret this character on its own, but leave it to tcl. Similarly the backslash before '/' tells xschem the slash and remaining characters are not part of the tcl variable name.

Thank you 🙂