Im trying to simulate an adder circuit which produces an output
depending on an 'input offset'. That is the offset gets added to itself and whenever the addition results in an overflow it
should produce an output.
The adder is a 4 bit adder and so whener the sum exceeds 1111 it shud
produce a carry out and the resulting sum shud substract 16 from itself and
produce a new sum which would then be smaller than 1111. I hope u get
I made schematic for the circuit which consists of a simple 4 bit
Ripple carry adder and a register driven by the clock because I want
the addition to take place with the clock. The output of the adder
feeds the register and the reg op feeds one of the inputs to the
adder thus creating a loop structure.
After doing that I create a symbol out of it and use it in a TB to see
After certain simulation trials of the Test bench i get this strange
error in the spectre.out file which says that "I11 instance is an
instance of an undefined model subcircuit" . Here 'I11' refers to the
instance name of the symbol I created earlier.
This strange error disappears when i make an exact copy of the same
Test Bench schematic into another schematic. And again after a while
the same error pops up and then i recreate another schematic and then
it works..which is becoming kind of annoying. Does anyone have any
pointers as to why is it happening?
Hope to get some hints about that.
Hello.Here I face the same problem again. Get the same message in the spectre.out window which reads Command line: /sw/cadence/IC5141_USR2/tools.lnx86/spectre/bin/32bit/spectre -env \ artist5.1.0 +escchars +log ../psf/spectre.out -format psfbin \ -raw ../psf +lqtimeout 900 +param \ /sw/cadence/libraries/ams_hit-3.70/spectre/ams_range.lmts \ input.scsLoading /sw/cadence/IC5141_USR2/tools.lnx86/cmi/lib/4.0/libinfineon_sh.so ...Loading /sw/cadence/IC5141_USR2/tools.lnx86/cmi/lib/4.0/libnortel_sh.so ...Loading /sw/cadence/IC5141_USR2/tools.lnx86/cmi/lib/4.0/libphilips_sh.so ...Loading /sw/cadence/IC5141_USR2/tools.lnx86/cmi/lib/4.0/libsparam_sh.so ...Loading /sw/cadence/IC5141_USR2/tools.lnx86/cmi/lib/4.0/libstmodels_sh.so ...spectre (ver. 5.10.41_USR2.052705 -- 27 May 2005).Includes RSA BSAFE(R) Cryptographic or Security Protocol Software from RSA Security, Inc.Simulating `input.scs' on asgard-07.edu.isy.liu.se at 3:59:06 PM, Fri Apr 13, 2007.Notice from spectre in `modn', during circuit read-in. modn.mosinsub: `jsw' has the unusual value of 130 pA/m.Notice from spectre in `modnm', during circuit read-in. modnm.mosinsub: `jsw' has the unusual value of 130 pA/m.Notice from spectre in `modpm', during circuit read-in. modpm.mosinsub: `jsw' has the unusual value of 610 pA/m.Notice from spectre in `modp', during circuit read-in. modp.mosinsub: `jsw' has the unusual value of 610 pA/m.Notice from spectre in `modnmh', during circuit read-in. modnmh.mosinsub: `jsw' has the unusual value of 130 pA/m. Further occurrences of this notice will be suppressed.Error found by spectre during circuit read-in. input.scs: I0 is an instance of an undefined model subcircuit.spectre terminated prematurely due to fatal error.Heres is the problem. I do not know what exactly is the problem which is causing this error. So im posting a gzipped version of the entire library.The schematic view of "therm_to_bin_TB" is the one which I am simulating and the one which is giving me this error. Please do have a look at the schematic. u can just untar the folder and add it as a library. Hope u can find some thing which can point us towards the exact cause of this annoying errorHope this time I have something concrete for you to have a look.Best Regards,Aijaz Baig.