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		XSPICE Press Release

		  January 22, 1993

  	 Georgia Tech Research Corporation


XSPICE, introduced at the 1992 International Symposium on Circuits and
Systems (ISCAS), is an extended and enhanced version of the popular
SPICE analog circuit simulation program originally developed at the
University of California at Berkeley. XSPICE was developed at the
Georgia Tech Research Institute (GTRI) as a tool for simulating
circuits and systems at multiple levels of abstraction. XSPICE permits
a user to simulate analog, digital, and even non-electronic designs
from the circuit level through the system level in a single simulator.
A special Code Modeling feature allows users to add new models
directly into the simulator executable for maximum simulation speed
and accuracy. Code models are written in the C programming language
allowing arbitrarily complex behavior to be described. Code model
development tools are provided to simplify the process of creating new
models, compiling them, and linking them with the XSPICE core.

XSPICE provides a rich set of predefined code models in addition to
the standard discrete device models available in SPICE. The XSPICE
code model library contains over 40 new functional blocks including
summers, multipliers, integrators, magnetics models, limiters,
S-domain transfer functions, digital gates, digital storage elements,
and a generalized digital state-machine.

Digital functions are simulated in XSPICE through an embedded
event-driven algorithm added to the SPICE core. This algorithm is
coordinated with the analog simulation algorithm to provide fast and
accurate simulation of mixed-signal circuits and systems. The
event-driven algorithm supports a new "User-Defined Node" capability
allowing additional event-driven data types to be defined and used.
XSPICE comes with a 12-state digital data type as well as a
user-defined node library that includes 'real' and 'integer' types
useful in simulating sampled-data systems such as Digital Signal
Processing algorithms.

XSPICE is currently available for UNIX workstations and is supplied in
source code form allowing users to customize and extend the simulator
and models to particular needs. To date, the simulator has been
successfully compiled and used on HP Apollo and Sun workstations. The
XSPICE simulator and User's Manual are available with a cost-free
license arrangement from the Georgia Tech Research Corporation for a
distribution charge of US $200 (including first class postage within
the U.S.A.; an additional US $25 is required for overseas delivery by
air). For further information, please contact the Office of Technology
Licensing, Georgia Tech Research Corporation, Georgia Institute of
Technology, 400 Tenth Street, Atlanta, GA 30332-0415, USA, or phone
(404) 894-6287 (voice) or (404) 894-9728 (FAX). Internet users may
send email to XSPICE@GTRI.GATECH.EDU to obtain copies of the order
form and license agreement (please include the word "license" in the
subject header when mailing to this address).
--
MURRAY,JEFFREY P
Georgia Institute of Technology, Atlanta Georgia, 30332
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