luke
/
iverilog
mirror of https://github.com/steveicarus/iverilog.git
1
0
Fork 0
Code Issues Packages Projects Releases Wiki Activity

Draw code for a delayed enable to tranif gates.

This commit is contained in:
Stephen Williams 2010-07-19 21:14:29 -07:00
parent ae3b6a9de2
commit a436f7f794
1 changed files with 31 additions and 10 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

41
tgt-vvp/draw_switch.c
View File

@ -36,19 +36,19 @@ void draw_switch_in_scope(ivl_switch_t sw)
ivl_expr_t rise_exp = ivl_switch_delay(sw, 0);
ivl_expr_t fall_exp = ivl_switch_delay(sw, 1);
ivl_expr_t decay_exp= ivl_switch_delay(sw, 2);
/* We do not support tran delays. */
if ((rise_exp || fall_exp) &&
if ((rise_exp || fall_exp || decay_exp) &&
(!number_is_immediate(rise_exp, 64, 0) ||
number_is_unknown(rise_exp) ||
(get_number_immediate(rise_exp) != 0) ||
!number_is_immediate(fall_exp, 64, 0) ||
number_is_unknown(fall_exp) ||
(get_number_immediate(rise_exp) != 0))) {
fprintf(stderr, "%s:%u: sorry: tranif gates with a delay are not "
"currently support.\n",
!number_is_immediate(decay_exp, 64, 0) ||
number_is_unknown(decay_exp))) {
fprintf(stderr, "%s:%u: error: Invalid tranif delay expression.\n",
ivl_switch_file(sw), ivl_switch_lineno(sw));
exit(1);
vvp_errors += 1;
}
island = ivl_switch_island(sw);
@ -65,9 +65,30 @@ void draw_switch_in_scope(ivl_switch_t sw)
enable = ivl_switch_enable(sw);
str_e = 0;
if (enable)
str_e = draw_island_net_input(island, enable);
char str_e_buf[4 + 2*sizeof(void*)];
if (enable && rise_exp) {
assert(fall_exp && decay_exp);
/* If the enable has a delay, then generate a .delay
node to delay the input by the specified amount. Do
the delay outside of the island so that the island
processing doesn't have to deal with it. */
const char*raw = draw_net_input(enable);
fprintf(vvp_out, "%s/d .delay 1 "
"(%" PRIu64 ",%" PRIu64 ",%" PRIu64 ") %s;\n",
raw, get_number_immediate64(rise_exp),
get_number_immediate64(fall_exp),
get_number_immediate64(decay_exp), raw);
fprintf(vvp_out, "p%p .import I%p, %s/d;\n", enable, island, raw);
snprintf(str_e_buf, sizeof str_e_buf, "p%p", enable);
str_e = str_e_buf;
} else if (enable) {
str_e = draw_island_net_input(island, enable);
}
switch (ivl_switch_type(sw)) {
case IVL_SW_TRAN:
@ -93,8 +114,8 @@ void draw_switch_in_scope(ivl_switch_t sw)
}
fprintf(vvp_out, " I%p, %s %s", island, str_a, str_b);
if (enable)
if (enable) {
fprintf(vvp_out, ", %s", str_e);
}
fprintf(vvp_out, ";\n");
}