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Implement a-b muxes as vector devices

This commit is contained in:
steve 2005-02-12 22:54:29 +00:00
parent d00e3fc9a9
commit d4eb4d38bc
2 changed files with 21 additions and 26 deletions
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40
tgt-vvp/draw_mux.c
View File

@ -17,7 +17,7 @@
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
*/
#ifdef HAVE_CVS_IDENT
#ident "$Id: draw_mux.c,v 1.7 2003/12/19 01:27:10 steve Exp $"
#ident "$Id: draw_mux.c,v 1.8 2005/02/12 22:54:29 steve Exp $"
#endif
# include "vvp_priv.h"
@ -28,6 +28,7 @@
# include <stdlib.h>
# include <string.h>
#if 0
/*
* This draws a general mux, a slice at a time. Use MUXX so that
* unknows lead to unknown output.
@ -136,6 +137,7 @@ static void draw_lpm_mux_bitslice(ivl_lpm_t net, unsigned slice)
draw_input_from_net(s);
fprintf(vvp_out, ", C<1>;\n");
}
#endif
/*
* This draws a simple A/B mux. The mux can have any width, enough
@ -143,48 +145,38 @@ static void draw_lpm_mux_bitslice(ivl_lpm_t net, unsigned slice)
*/
static void draw_lpm_mux_ab(ivl_lpm_t net)
{
ivl_nexus_t s;
unsigned idx, width;
/* Only support A-B muxes at this oint. */
/* Only support A-B muxes in this function. */
assert(ivl_lpm_size(net) == 2);
assert(ivl_lpm_selects(net) == 1);
width = ivl_lpm_width(net);
s = ivl_lpm_select(net, 0);
for (idx = 0 ; idx < width ; idx += 1) {
ivl_nexus_t a = ivl_lpm_data2(net, 0, idx);
ivl_nexus_t b = ivl_lpm_data2(net, 1, idx);
fprintf(vvp_out, "L_%s.%s/%u .functor MUXZ, ",
vvp_mangle_id(ivl_scope_name(ivl_lpm_scope(net))),
vvp_mangle_id(ivl_lpm_basename(net)), idx);
draw_input_from_net(a);
fprintf(vvp_out, ", ");
draw_input_from_net(b);
fprintf(vvp_out, ", ");
draw_input_from_net(s);
fprintf(vvp_out, ", C<1>;\n");
}
fprintf(vvp_out, "L_%p .functor MUXZ", net);
fprintf(vvp_out, ", %s", draw_net_input(ivl_lpm_data(net,0)));
fprintf(vvp_out, ", %s", draw_net_input(ivl_lpm_data(net,1)));
fprintf(vvp_out, ", %s", draw_net_input(ivl_lpm_select(net,0)));
fprintf(vvp_out, ", C4<>;\n");
}
void draw_lpm_mux(ivl_lpm_t net)
{
unsigned idx;
if ((ivl_lpm_size(net) == 2) && (ivl_lpm_selects(net) == 1)) {
draw_lpm_mux_ab(net);
return;
}
# if 0
for (idx = 0 ; idx < ivl_lpm_width(net) ; idx += 1)
draw_lpm_mux_bitslice(net, idx);
# else
fprintf(stderr, "XXXX Forgot how to implement wide muxes.\n");
#endif
}
/*
* $Log: draw_mux.c,v $
* Revision 1.8 2005/02/12 22:54:29 steve
* Implement a-b muxes as vector devices
*
* Revision 1.7 2003/12/19 01:27:10 steve
* Fix various unsigned compare warnings.
*

7
tgt-vvp/vvp_scope.c
View File

@ -17,7 +17,7 @@
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
*/
#ifdef HAVE_CVS_IDENT
#ident "$Id: vvp_scope.c,v 1.117 2005/02/12 06:25:15 steve Exp $"
#ident "$Id: vvp_scope.c,v 1.118 2005/02/12 22:54:29 steve Exp $"
#endif
# include "vvp_priv.h"
@ -551,7 +551,6 @@ static const char* draw_net_input_drive(ivl_nexus_t nex, ivl_nexus_ptr_t nptr)
if (lpm) switch (ivl_lpm_type(lpm)) {
case IVL_LPM_FF:
case IVL_LPM_MUX:
for (idx = 0 ; idx < ivl_lpm_width(lpm) ; idx += 1)
if (ivl_lpm_q(lpm, idx) == nex) {
sprintf(result, "L_%s.%s/%u",
@ -580,6 +579,7 @@ static const char* draw_net_input_drive(ivl_nexus_t nex, ivl_nexus_ptr_t nptr)
case IVL_LPM_SHIFTR:
case IVL_LPM_SUB:
case IVL_LPM_MULT:
case IVL_LPM_MUX:
case IVL_LPM_DIVIDE:
case IVL_LPM_MOD:
case IVL_LPM_UFUNC:
@ -2041,6 +2041,9 @@ int draw_scope(ivl_scope_t net, ivl_scope_t parent)
/*
* $Log: vvp_scope.c,v $
* Revision 1.118 2005/02/12 22:54:29 steve
* Implement a-b muxes as vector devices
*
* Revision 1.117 2005/02/12 06:25:15 steve
* Draw C4 and C8 constants to account for strength.
*