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doc updates (multi project setup, tutorial_xschem_libraries.html)

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Stefan Frederik 2022-10-14 11:23:46 +02:00
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doc/xschem_man/tutorial_xschem_libraries.html
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@ -93,6 +93,57 @@ p{padding: 15px 30px 10px;}
You may choose either method, but please be consistent throughout your design.
</h3>
<h1> Change project setup runtime</h1>
<p>
Since Xschem now handles multiple windows or tabs, it is desirasble to load schematics from different projects
into a single running instance of xschem.
This is not difficult to do and you might want to write your own procedure into your xschemrc to automate this.
Lets suppose you open a new schematic tab. After opening the new tab go to the xschem prompt in the terminal
you launched Xschem from, and redefine your XSCHEM_LIBRARY_PATH:</p>
<pre class="code">
set XSCHEM_LIBRARY_PATH {} ;# clear previous definitions
append XSCHEM_LIBRARY_PATH :${XSCHEM_SHAREDIR}/xschem_library ;# for devices/
append XSCHEM_LIBRARY_PATH :/home/schippes/share/pdk/sky130A/libs.tech/xschem ;# for sky130 libs
# project specific variables (either tcl variables or shell variables via the TCL env() array)
set PDK_ROOT /home/schippes/share/pdk
set PDK sky130A
set SKYWATER_MODELS ${PDK_ROOT}/${PDK}/libs.tech/ngspice
set SKYWATER_STDCELLS ${PDK_ROOT}/${PDK}/libs.ref/sky130_fd_sc_hd/spice
# the following command does the necessary housekeeping to load the new paths
set_paths
</pre>
<p>
At this point your new tab will work with the new defnitions while the previous tab
will continue with its previous settings.
</p>
<p class="important">
you should create a small procedure and put int into your xschemrc so you will just need to type the
procedure name:
</p><br>
<pre class="code">
proc set_sky130 {} {
## XSCHEM_SHAREDIR points to XSCHEM install path, example: /usr/local/share/xschem
## USER_CONF_DIR is usually ~/.xschem
## env may be used to set environment variables, like:
## set env(PDK_ROOT) .....
global XSCHEM_LIBRARY_PATH XSCHEM_SHAREDIR USER_CONF_DIR env
## Other global TCL variables listed here depend on the project setup.
global PDK_ROOT PDK SKYWATER_MODELS SKYWATER_STDCELLS
# project specific variables (either tcl variables or shell variables via the TCL env() array)
set PDK_ROOT /home/schippes/share/pdk
set PDK sky130A
set SKYWATER_MODELS ${PDK_ROOT}/${PDK}/libs.tech/ngspice
set SKYWATER_STDCELLS ${PDK_ROOT}/${PDK}/libs.ref/sky130_fd_sc_hd/spice
set XSCHEM_LIBRARY_PATH {} ;# clear previous definitions
append XSCHEM_LIBRARY_PATH :${XSCHEM_SHAREDIR}/xschem_library ;# for devices/
append XSCHEM_LIBRARY_PATH :${PDK_ROOT}/${PDK}/libs.tech/xschem
# the following command does the necessary housekeeping to load the new paths
set_paths
}
</pre>
<!-- end of slide -->
<div class="filler"></div>
</div>