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Support .net constant inputs.

This commit is contained in:
steve 2001-04-29 22:59:46 +00:00
parent 31291f5d8a
commit 014e68b62f
2 changed files with 37 additions and 2 deletions
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12
vvp/README.txt
View File

@ -1,7 +1,7 @@
/*
* Copyright (c) 2001 Stephen Williams (steve@icarus.com)
*
* $Id: README.txt,v 1.18 2001/04/26 03:10:55 steve Exp $
* $Id: README.txt,v 1.19 2001/04/29 22:59:46 steve Exp $
*/
VVP SIMULATION ENGINE
@ -260,6 +260,16 @@ legal to leave a bit unconnected. To do that, simply leave the
position for that bit blank. Bits of .nets are initialized to
z. Unconnected bits keep the value z throughout the simulation.
The special input symbols "C<0>", "C<1>", "C<x>" and "C<z>" and magic
symbols that set the net to a constant value instead of accepting an
input from a functor. This can happen, for example, when a wire is
declared like so:
wire foo = 1'b1;
This prevents any real functor being created and connected, and
instead leaves the input unconnected and initializes the wire with the
specified value, instead of the default z.
EVENT STATEMENTS

27
vvp/compile.cc
View File

@ -17,7 +17,7 @@
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
*/
#if !defined(WINNT)
#ident "$Id: compile.cc,v 1.44 2001/04/28 20:24:03 steve Exp $"
#ident "$Id: compile.cc,v 1.45 2001/04/29 22:59:46 steve Exp $"
#endif
# include "compile.h"
@ -798,6 +798,26 @@ void compile_net(char*label, char*name, int msb, int lsb, bool signed_flag,
continue;
}
if (strcmp(argv[idx].text, "C<0>") == 0) {
obj->oval = 0;
continue;
}
if (strcmp(argv[idx].text, "C<1>") == 0) {
obj->oval = 1;
continue;
}
if (strcmp(argv[idx].text, "C<x>") == 0) {
obj->oval = 2;
continue;
}
if (strcmp(argv[idx].text, "C<z>") == 0) {
obj->oval = 3;
continue;
}
symbol_value_t val = sym_get_value(sym_functors, argv[idx].text);
if (val.num) {
@ -858,6 +878,8 @@ void compile_cleanup(void)
} else {
/* Still not resolved. put back into the list. */
fprintf(stderr, "unresolved functor reference: %s\n",
res->source);
res->next = resolv_list;
resolv_list = res;
}
@ -909,6 +931,9 @@ void compile_dump(FILE*fd)
/*
* $Log: compile.cc,v $
* Revision 1.45 2001/04/29 22:59:46 steve
* Support .net constant inputs.
*
* Revision 1.44 2001/04/28 20:24:03 steve
* input connect cleanup. (Stephan Boettcher)
*