[Help-gnucap] GNUCAP IBIS Output File Details

[Bob Newgard]

I'm trying to follow the ibis model converter output.  My understanding
is that the output is SPICE, plus maybe some GNUCAP extensions.  Where
are the switch args 'on', 'turnon' and 'turnoff' documented?  The real
mystery to me is where in the source code the strings  'on', 'turnon'
and 'turnoff' are defined (cd src ; grep -i turnoff).

Details:

I ran 'ibis' from the ibis.2003.04.15.tar.gz distribution
against the TI CDCVF2310 ibis model
(http://www-s.ti.com/sc/psheets/scac026b/scac026b.ibs).

The resulting .ckt file contains the following:

.model pullup_switch sw vt=0.5 on=
+ 3.3 0.07519
+ 0.1 0.00218
...
+ -6.7 -0.07607
+ turnon =
+ 0 -0
+ 3.76e-10 -0
...
+ 2.97e-09 1
+ turnoff =
+ 0 1
+ 4.82e-11 1
...

Section 3.1 of the User's Manual describes '.model' and 'sw'.  Section 3.19
describes 'vt=', but doesn't document 'on', 'turnon' and 'turnoff'.