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Verilog Behavioral Simulation version 1.4.0
This is the public release of the Verilog Behavioral Simulator.
Verilog is a Hardware Description Language used mostly for digital circuit
design and simulation. This program is a simple implementation of a
Verilog simulator. VBS tries to implement all of the Verilog behavioral
constructs that are synthesizable, but still allow complex test vectors
for simulation.
What's New in 1.4.0
This release contains many bug fixes and a few new features. The new
features include:
Shell interface for Guile
$dump* API support
Multiple/lvalue concatenation
Net declaration assignment
Delay or event control in non-blocking assignment
Hierarchical variable reference
There are too many bug fixes to list here. VBS now passes many of the
test cases in the IVL test suite maintained by Steven Wilson. The
Makefile includes a target to run through those test cases. The test
suite can be downloaded from the Icarus project; icarus.com.
For full details of all changes, see the CHANGELOG.
What's New in 1.3.7
This release adds support for $random system function. See the CHANGELOG
file for details. The big change in this release is that there's now a
CVS server and a mailing list. Both are hosted by Simple End User Linux
(SEUL) as part of the gEDA project. See 'Getting the source code' for the
FTP site. There is no dedicated mailing list for VBS discussions. But
The gEDA mailing list is willing to allow VBS discussions. Visit the gEDA
project web site at
http://geda.seul.org/
or
http://www.seul.org/
for details on the mailing list and other services. A CVS tree of the
latest VBS source code may also be found at the above site. Visit the
official VBS web page for more details.
What's New in 1.3.6
This release is another maintenance release. Patches from a few users have
been applied. Please see the CONTRIBUTORS file for details. This release
is mainly for fixing problems with building on glibc2 and the latest egcs
compiler. I should mention one gotcha. I currently use egcs 1.0.3, which
does not support the -ftemplate-depth parameter. Users have reported that
this parameter is needed with the latest egcs. Since I don't have the
latest egcs, I can not verify this. What I have done instead is to provide
a configure option (--with-template-depth) to allow the user to set this
parameter if one is needed. To use it, type:
configure --with-template-depth=32
This will generate a Makefile with the correct parameter for egcs to overcome
a template depth problem found in sim.cc. As usual, feedback and patches
are always welcomed. Enjoy!
What's New in 1.3.5
This release is only a bug fix release. VBS can now be compiled with the
egcs compiler. A configure script is provided to detect which compiler
and other tools for generating the vbs binary. VBS can still be compiled
with gcc 2.7.2.X + frepo. Future development has stopped on VBS. I am
now working on a compiled simulator with the FreeHDL group. I do not know
when source will be available from this project. You can find out more by
visiting the FreeHDL web site:
http://www.freehdl.seul.org/
A mailing list also exists, if you want to join the effort. I will
continue to accept patches and make future releases. If this turns out to
be the last release, I would like to thank all of you who have sent
feedback and patches.
What's New in 1.3.4
This release includes some bug fixes reported by users. See below
for a list of new features. The preprocessor used in this release is
optional. The preprocessor program is searched in the following
directories:
vbs (directory where vbs is located)
/bin
/usr/bin
/usr/local/bin
. (current directory)
The name of the preprocessor program must be 'vpp'. If no preprocessor is
found, a straight copy is done on the input. This may cause the compile
step to fail if the input file contained preprocessing directives not
supported by vbs. If there is an error in the compilation, the line
numbering may be invalid, since currently there is no support for file
name and number reporting. You can find a preprocessor in my home page
listed below, called vbpp. It is a seperate software package from vbs, so
they will not be distributed together.
Supported features:
o $dump* (v.1.4.0)
o multiple/lvalue concatenation (v.1.4.0)
o preprocessor integration (v.1.3.4)
o expressions as port connections (v.1.3.4)
o rhs concatenation (v.1.3.4)
o CPU usage statistics (v.1.3.3)
o parameter declaration (v.1.3.3)
o ternary operator (v.1.3.2)
o mintypmax (v.1.3.2)
o memory declaration (v.1.3.1)
o $strobe system task (v.1.3.1)
o integer declaration (v.1.3.1)
o operator !==/=== (v.1.3.1)
o evaluation of qouted string (v.1.3.1)
o user defined functions and tasks (v.1.3.0)
o multiple trigger types in event control (v.1.3.0)
o event control in initial procedural block (v.1.3.0)
o delay events in loops (v.1.3.0)
o forever, repeat and while loops (v.1.3.0)
o delays as event control in 'always' procedural blocks (v.1.3.0)
o continuous assignment (v.1.3.0)
o bit select (v.1.3.0)
Contents
This distribution contains the source code to the Verilog Behavioral
Simulator. This directory contains the following subdirectories and files:
CHANGELOG Log of changes to the base code.
CONTRIBUTORS Contributors to this project.
COPYING-2.0 GNU General Public License
COPYRIGHT Copyright information.
TODO File containing todo list (and bugs).
README This file.
src/ Unarchived directory of latest working version.
src/tests/ Directory containing test programs for objects.
EXAMPLES/ Example verilog code to test the simulator.
docs/ Directory of documentation.
Getting the source code:
Source code to this project can be obtained from the Linux archive site
on the world wide web. The URL is:
ftp://sunsite.unc.edu/pub/Linux/apps/circuits/vbs-X.X.X.tar.gz
ftp://ftp.geda.seul.org/pub/geda/dist/vbs-X.X.X.tar.gz
The authors do not maintain this site, so the location could change without
notice. Or...
http://www.flex.com/~jching
This is the official home page for VBS. The author does maintain this site.
Compiling VBS
The following is needed:
flex 2.3 or later
Or any POSIX lex which can generate ANSI C code. (*) (**)
bison 1.22 or later
POSIX yacc should work too. Must be able to create the
header file 'yy.tab.h', as well as ANSI C code. (**)
Any ANSI C compiler
Tested with GCC 2.7.2, 2.95.x and 3.0.
C++ compiler that supports templates and namespace.
Tested with G++ 2.7.2 with the -frepo patch. (***)
Version G++ 2.7.0 is known not to compile the simulator.
EGCS, 2.95.x and 3.0 is now supported.
(*) If you use flex 2.3, you might need to undefine 'yywrap'. Version
2.3 has this word defined rather than a function in the library.
(**) We use both ANSI and POSIX standards. Thus, if turning on ANSI with
your C or C++ compiler breaks the POSIX code, do not turn on ANSI. This
is the case for GCC. Turning on ANSI (-ansi) will turn off POSIX. This
only applies to the file vbs.cc. This file uses POSIX functions.
(***) See the FAQ for more details on obtaining and using the -frepo
patch.
1. Make a directory for the objects, 'mkdir obj'.
2. Change into the 'obj' directory.
3. Type the command '<srcdir>/configure' to generate the Makefile and
other required files. This script will detect required system headers and
tools to build the vbs executable. If anything is missing, you will not
be able to proceed. When the configure script is done, there will be some
instructions, please follow them to compile vbs. (*)
4. Run the program on example files by typing:
vbs <srcdir>/../EXAMPLES/test.v
Where 'test' is one of the pre-made tests. (**)
5. You can install the vbs binary by just copying it into your path. vbs
is a self contained binary, no config files are needed.
(*) If you receive any warnings about "defined but not used" or
"assignment between integer and pointer", ignore these. They are problems
with the system files, not this package. <srcdir> is the directory where
the src is located. Note, the src directory is under the main vbs-X.X.X
directory.
(**) The output of the executable may contain a few debug statements for
easier analysis. Type 'vbs --help' for a list of options on debugging
output.
Testing individual C++ objects:
1. Change directory into the 'obj' directory
2. Type 'make' to get a list of targets.
3. Type 'make <target>' to test that object.
Note: the test modules do not test every conceivable permutation of usage
for the C++ classes. Only basic, or required, methods (member functions)
are tested, because we need to use them.
As usual, this program has only been tested on a Linux system. If you
find any problems, or have questions and comments, please send them to
the mailing list.
If you wish to help develop this simulator, feel free to jump in. All
discussions are done on the mailing list. Send patches to me directly,
though. Patches should be in unified diff format, i.e. diff -u.
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