$Id: README,v 1.8 1997/01/23 07:33:22 fabio Exp fabio $

WHAT IS NANOTRAV

This directory contains nanotrav, a simple reachability analysis program based on the CUDD package. Nanotrav uses a very naive approach and is only included to provide a sanity check for the installation of the CUDD package.

Nanotrav reads a circuit written in a small subset of blif. This format is described in the comments in bnet.c. Nanotrav then creates BDDs for the primary outputs and the next state functions (if any) of the circuit.

If, passed the -trav option, nanotrav builds a BDD for the characteristic function of the transition relation of the graph. It then builds a BDD for the initial state(s), and performs reachability analysis. Reachability analysys is performed with either the method known as "monolithic transition relation method," whose main virtue is simplicity, or with an unsophisticated partitioned transition relation method.

Once it has completed reachability analysis, nanotrav prints results and exits. The amount of information printed, as well as several other features are controlled by the options. For a complete list of the options, consult the man page. Here, we only mention that the options allow the user of nanotrav to select among different reordering options.

TEST CIRCUITS

Twelve test circuits are contained in this directory. The results or running nanotrav on them with various options are also included. These tests are run as part of "make check." Notice that rcn25 requires approximately 30 s. All other tests take much less.