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From: info-vlsi@ucbvax.UUCP
Newsgroups: mod.vlsi
Subject: Re: SPICE Rack Volume 4 Number 1
Message-ID: <8601021834.AA06819@sdcsvax.ARPA>
Date: Thu, 2-Jan-86 13:34:14 EST
Article-I.D.: sdcsvax.8601021834.AA06819
Posted: Thu Jan  2 13:34:14 1986
Date-Received: Fri, 3-Jan-86 02:20:15 EST
References: <[USC-ECL.ARPA]20-Dec-85.12:37:40.MBALAMUT>
Sender: daemon@ucbvax.BERKELEY.EDU
Organization: NCR Corporation, Rancho Bernardo
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Approved: info-vlsi@sandia-cad.arpa

In article <[USC-ECL.ARPA]20-Dec-85.12:37:40.MBALAMUT> you write:
>
>
>  A  new  version  of  the  SPICE  circuit  simulator,  SPICE3, has been
>  written.   This version uses the same basic algorithms and device mod-
>  els  as  previous SPICE2 versions, but is a completely new implementa-
>  tion  in  the  C  programming  language.  The  use of C simplifies the
>  program  significantly  because  the  language  supports  complex data
>  structures,  dynamic  storage  allocation,  and pointers, all of which
>  were  needed  by  SPICE2 and also required significant additional code
>  and complexity of implement in FORTRAN.
>
>  This  new version breaks the program into a number of independent mod-
>  ules,  each  of  which  interacts with the others through a few simple
>  subroutine  calls  only,  thus allowing modules implementing new algo-
>  rithms  or  devices  to  be substituted or added with relative ease. A
>  major  separation between input, analysis, and output was also made to
>  allow the analysis section to be used as a subroutine package within a
>  much larger program.
>
>  The program is currently running with almost all the devices supported
>  by SPICE2 at speeds from two to three times that of SPICE2. Additional
>  work  is  in  progress  to  improve  program efficiency, implement the
>  remaining  SPICE2 devices, add further devices and models (such as the
>  BSIM  model),  and improve the convergence characteristics of the pro-
>  gram.
>


If you are not the correct person to answer these questions,
could you forward this request to the appropriate place.
Thanks.

----------

I am interested in the conversion effort from SPICE2 to
SPICE3 (I am not familiar at all with the SPICE program).

How large is SPICE2 ?  lines of Fortran, number of
		subroutines  ... ?

How large is SPICE3 ?  lines of "C", number of
		subroutines  ... ?

How long did the conversion take?  how many people?  total
		number of fulltime person months?

----------
Steve Schlesinger
{ihnp4, sdcsvax}!ncr-sd!steves