template.yaml

What cicsim simcell reads to create a new simulation directory.

make cell LIB=<LIB> CELL=<CELL>     # from sim/

create

Writes a local cicsim.yaml that adds two view corners on top of the shared cicsim/cicsim.yaml:

options:
  useTmpDir: False
  sha: True
corner:
  Lay: ''
  Sch: ''
ngspice:
  library: ${IP}
  cell: ${CELL}

Sch and Lay are empty corners: they add nothing to the netlist, and exist so the view can be named on the command line and end up in the result directory name. tran.spi then switches on Lay with #ifdef to include the extracted netlist instead of the schematic one.

sha: True is a caching switch, not a bookkeeping one. cicsim hashes every input file it references, saves them as <run>.sha, and on the next run compares. If nothing has changed it prints “No spice files have changed” and skips the simulation entirely; the .meas file is hashed separately, so an unchanged measurement file on top of a skipped simulation skips the measurement run too. That is what makes a repeated make typical cheap, and also why a run that “did nothing” is usually correct rather than broken. Pass --no-sha to force it.

useTmpDir: False keeps the run directory where it is. With it on, cicsim puts the run under /tmp/cicsim/$USER/<lib>/<cell>/<rundir>, symlinks it into place, and rewrites ../ in every .include and .lib to an absolute path so the relocated netlist still resolves. Off is the easier thing to debug, since the files are simply there.

copy

tran.spi, tran.py, tran.meas, tran.yaml, Makefile, summary.yaml.

do

Runs make netlist, then git adds the seven files, so a new testbench is staged and nothing is forgotten.