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Create a BUFZ to drive the 0.0 value onto an undriven real wire. 

This is needed to allow forced values to propagate correctly.
This commit is contained in:
Martin Whitaker 2015-06-26 00:45:00 +01:00
parent 59c211d20c
commit 05a52e55e9
1 changed files with 12 additions and 12 deletions
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24
tgt-vvp/draw_net_input.c
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@ -1,5 +1,5 @@
/* /*
* Copyright (c) 2001-2012 Stephen Williams (steve@icarus.com) * Copyright (c) 2001-2015 Stephen Williams (steve@icarus.com)
* *
* This source code is free software; you can redistribute it * This source code is free software; you can redistribute it
* and/or modify it in source code form under the terms of the GNU * and/or modify it in source code form under the terms of the GNU
@ -699,11 +699,12 @@ static void draw_net_input_x(ivl_nexus_t nex,
/* If the nexus has no drivers, then send a constant HiZ or /* If the nexus has no drivers, then send a constant HiZ or
0.0 into the net. */ 0.0 into the net. */
if (ndrivers == 0) { if (ndrivers == 0) {
unsigned wid = width_of_nexus(nex);
/* For real nets put 0.0. */ /* For real nets put 0.0. */
if (signal_data_type_of_nexus(nex) == IVL_VT_REAL) { if (signal_data_type_of_nexus(nex) == IVL_VT_REAL) {
nex_private = draw_Cr_to_string(0.0); nex_private = draw_Cr_to_string(0.0);
} else { } else {
unsigned jdx, wid = width_of_nexus(nex); unsigned jdx;
char*tmp = malloc(wid + 5); char*tmp = malloc(wid + 5);
nex_private = tmp; nex_private = tmp;
strcpy(tmp, "C4<"); strcpy(tmp, "C4<");
@ -727,18 +728,17 @@ static void draw_net_input_x(ivl_nexus_t nex,
} }
*tmp++ = '>'; *tmp++ = '>';
*tmp = 0; *tmp = 0;
/* Create an "open" driver to hold the HiZ. We
need to do this so that .nets have something to
hang onto. */
char buf[64];
snprintf(buf, sizeof buf, "o%p", nex);
fprintf(vvp_out, "%s .functor BUFZ %u, %s; HiZ drive\n",
buf, wid, nex_private);
nex_private = realloc(nex_private, strlen(buf)+1);
strcpy(nex_private, buf);
} }
/* Create an "open" driver to hold the HiZ or 0.0. We need
to do this so that .nets have something to hang onto. */
char buf[64];
snprintf(buf, sizeof buf, "o%p", nex);
fprintf(vvp_out, "%s .functor BUFZ %u, %s; HiZ drive\n",
buf, wid, nex_private);
nex_private = realloc(nex_private, strlen(buf)+1);
strcpy(nex_private, buf);
if (island) { if (island) {
char*tmp2 = draw_island_port(island, island_input_flag, nex, nex_data, nex_private); char*tmp2 = draw_island_port(island, island_input_flag, nex, nex_data, nex_private);
free(nex_private); free(nex_private);