static char* draw_net_input_drive(ivl_nexus_t nex, ivl_nexus_ptr_t nptr)
{
unsigned nptr_pin = ivl_nexus_ptr_pin(nptr);
ivl_net_const_t cptr;
ivl_net_logic_t lptr;
ivl_signal_t sptr;
ivl_lpm_t lpm;
lptr = ivl_nexus_ptr_log(nptr);
if (lptr
&& ((ivl_logic_type(lptr)==IVL_LO_BUFZ)||(ivl_logic_type(lptr)==IVL_LO_BUFT))
&& (nptr_pin == 0))
do {
if (! can_elide_bufz(lptr, nptr))
break;
return strdup(draw_net_input(ivl_logic_pin(lptr, 1)));
} while(0);
/* If this is a pulldown device, then there is a single pin
that drives a constant value to the entire width of the
vector. The driver normally drives a pull0 value, so a C8<>
constant is appropriate, but if the drive is really strong,
then we can draw a C4<> constant instead. */
if (lptr && (ivl_logic_type(lptr) == IVL_LO_PULLDOWN)) {
if (ivl_nexus_ptr_drive0(nptr) == IVL_DR_STRONG) {
size_t result_len = ivl_logic_width(lptr) + 5;
char*result = malloc(result_len);
char*dp = result;
strcpy(dp, "C4<");
dp += strlen(dp);
str_repeat(dp, "0", ivl_logic_width(lptr));
dp += ivl_logic_width(lptr);
*dp++ = '>';
*dp = 0;
assert(dp >= result);
assert((unsigned)(dp - result) <= result_len);
return result;
} else {
char val[4];
size_t result_len = 3*ivl_logic_width(lptr) + 5;
char*result = malloc(result_len);
char*dp = result;
val[0] = "01234567"[ivl_nexus_ptr_drive0(nptr)];
val[1] = val[0];
val[2] = '0';
val[3] = 0;
strcpy(dp, "C8<");
dp += strlen(dp);
str_repeat(dp, val, ivl_logic_width(lptr));
dp += 3*ivl_logic_width(lptr);
*dp++ = '>';
*dp = 0;
assert(dp >= result);
assert((unsigned)(dp - result) <= result_len);
return result;
}
}
if (lptr && (ivl_logic_type(lptr) == IVL_LO_PULLUP)) {
char*result;
char tmp[32];
if (ivl_nexus_ptr_drive1(nptr) == IVL_DR_STRONG) {
size_t result_len = 5 + ivl_logic_width(lptr);
result = malloc(result_len);
char*dp = result;
strcpy(dp, "C4<");
dp += strlen(dp);
str_repeat(dp, "1", ivl_logic_width(lptr));
dp += ivl_logic_width(lptr);
*dp++ = '>';
*dp = 0;
assert(dp >= result);
assert((unsigned)(dp - result) <= result_len);
} else {
char val[4];
size_t result_len = 5 + 3*ivl_logic_width(lptr);
result = malloc(result_len);
char*dp = result;
val[0] = "01234567"[ivl_nexus_ptr_drive1(nptr)];
val[1] = val[0];
val[2] = '1';
val[3] = 0;
strcpy(dp, "C8<");
dp += strlen(dp);
str_repeat(dp, val, ivl_logic_width(lptr));
dp += 3*ivl_logic_width(lptr);
*dp++ = '>';
*dp = 0;
assert(dp >= result);
assert((unsigned)(dp - result) <= result_len);
}
/* Make the constant an argument to a BUFZ, which is
what we use to drive the PULLed value. */
fprintf(vvp_out, "L_%p .functor BUFT 1, %s, C4<0>, C4<0>, C4<0>;\n",
lptr, result);
snprintf(tmp, sizeof tmp, "L_%p", lptr);
result = realloc(result, strlen(tmp)+1);
strcpy(result, tmp);
return result;
}
if (lptr && (nptr_pin == 0)) {
char tmp[128];
snprintf(tmp, sizeof tmp, "L_%p", lptr);
return strdup(tmp);
}
sptr = ivl_nexus_ptr_sig(nptr);
if (sptr && (ivl_signal_type(sptr) == IVL_SIT_REG)) {
char tmp[128];
/* Input is a .var. This device may be a non-zero pin
because it may be an array of reg vectors. */
snprintf(tmp, sizeof tmp, "v%p_%u", sptr, nptr_pin);
if (ivl_signal_dimensions(sptr) > 0) {
fprintf(vvp_out, "v%p_%u .array/port v%p, %u;\n",
sptr, nptr_pin, sptr, nptr_pin);
}
return strdup(tmp);
}
cptr = ivl_nexus_ptr_con(nptr);
if (cptr) {
char *result = 0;
ivl_expr_t d_rise, d_fall, d_decay;
unsigned dly_width = 0;
/* Constants should have exactly 1 pin, with a literal value. */
assert(nptr_pin == 0);
switch (ivl_const_type(cptr)) {
case IVL_VT_LOGIC:
case IVL_VT_BOOL:
case IVL_VT_STRING:
if ((ivl_nexus_ptr_drive0(nptr) == IVL_DR_STRONG)
&& (ivl_nexus_ptr_drive1(nptr) == IVL_DR_STRONG)) {
result = draw_C4_to_string(cptr);
} else {
result = draw_C8_to_string(cptr,
ivl_nexus_ptr_drive0(nptr),
ivl_nexus_ptr_drive1(nptr));
}
dly_width = ivl_const_width(cptr);
break;
case IVL_VT_REAL:
result = draw_Cr_to_string(ivl_const_real(cptr));
dly_width = 0;
break;
default:
assert(0);
break;
}
d_rise = ivl_const_delay(cptr, 0);
d_fall = ivl_const_delay(cptr, 1);
d_decay = ivl_const_delay(cptr, 2);
/* We have a delayed constant, so we need to build some code. */
if (d_rise != 0) {
char tmp[128];
fprintf(vvp_out, "L_%p/d .functor BUFT 1, %s, "
"C4<0>, C4<0>, C4<0>;\n", cptr, result);
free(result);
/* Is this a fixed or variable delay? */
if (number_is_immediate(d_rise, 64, 0) &&
number_is_immediate(d_fall, 64, 0) &&
number_is_immediate(d_decay, 64, 0)) {
assert(! number_is_unknown(d_rise));
assert(! number_is_unknown(d_fall));
assert(! number_is_unknown(d_decay));
fprintf(vvp_out, "L_%p .delay %u "
"(%" PRIu64 ",%" PRIu64 ",%" PRIu64 ") L_%p/d;\n",
cptr, dly_width,
get_number_immediate64(d_rise),
get_number_immediate64(d_fall),
get_number_immediate64(d_decay), cptr);
} else {
ivl_signal_t sig;
// We do not currently support calculating the decay
// from the rise and fall variable delays.
assert(d_decay != 0);
assert(ivl_expr_type(d_rise) == IVL_EX_SIGNAL);
assert(ivl_expr_type(d_fall) == IVL_EX_SIGNAL);
assert(ivl_expr_type(d_decay) == IVL_EX_SIGNAL);
fprintf(vvp_out, "L_%p .delay %u L_%p/d",
cptr, dly_width, cptr);
sig = ivl_expr_signal(d_rise);
assert(ivl_signal_dimensions(sig) == 0);
fprintf(vvp_out, ", v%p_0", sig);
sig = ivl_expr_signal(d_fall);
assert(ivl_signal_dimensions(sig) == 0);
fprintf(vvp_out, ", v%p_0", sig);
sig = ivl_expr_signal(d_decay);
assert(ivl_signal_dimensions(sig) == 0);
fprintf(vvp_out, ", v%p_0;\n", sig);
}
snprintf(tmp, sizeof tmp, "L_%p", cptr);
result = strdup(tmp);
} else {
char tmp[64];
fprintf(vvp_out, "L_%p .functor BUFT 1, %s, "
"C4<0>, C4<0>, C4<0>;\n", cptr, result);
free(result);
snprintf(tmp, sizeof tmp, "L_%p", cptr);
result = strdup(tmp);
}
return result;
}
lpm = ivl_nexus_ptr_lpm(nptr);
if (lpm) switch (ivl_lpm_type(lpm)) {
case IVL_LPM_FF:
case IVL_LPM_ABS:
case IVL_LPM_ADD:
case IVL_LPM_ARRAY:
case IVL_LPM_CAST_INT2:
case IVL_LPM_CAST_INT:
case IVL_LPM_CAST_REAL:
case IVL_LPM_CONCAT:
case IVL_LPM_CONCATZ:
case IVL_LPM_CMP_EEQ:
case IVL_LPM_CMP_EQ:
case IVL_LPM_CMP_GE:
case IVL_LPM_CMP_GT:
case IVL_LPM_CMP_NE:
case IVL_LPM_CMP_NEE:
case IVL_LPM_RE_AND:
case IVL_LPM_RE_OR:
case IVL_LPM_RE_XOR:
case IVL_LPM_RE_NAND:
case IVL_LPM_RE_NOR:
case IVL_LPM_RE_XNOR:
case IVL_LPM_SFUNC:
case IVL_LPM_SHIFTL:
case IVL_LPM_SHIFTR:
case IVL_LPM_SIGN_EXT:
case IVL_LPM_SUB:
case IVL_LPM_MULT:
case IVL_LPM_MUX:
case IVL_LPM_POW:
case IVL_LPM_DIVIDE:
case IVL_LPM_MOD:
case IVL_LPM_UFUNC:
case IVL_LPM_PART_VP:
case IVL_LPM_PART_PV: /* NOTE: This is only a partial driver. */
case IVL_LPM_REPEAT:
if (ivl_lpm_q(lpm) == nex) {
char tmp[128];
snprintf(tmp, sizeof tmp, "L_%p", lpm);
return strdup(tmp);
}
break;
}
fprintf(stderr, "vvp.tgt error: no input to nexus.\n");
assert(0);
return strdup("C<z>");
}
void draw_switch_in_scope(ivl_switch_t sw)
{
ivl_island_t island;
ivl_nexus_t nex_a, nex_b, enable;
const char*str_a, *str_b, *str_e;
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);
if ((rise_exp || fall_exp || decay_exp) &&
(!number_is_immediate(rise_exp, 64, 0) ||
number_is_unknown(rise_exp) ||
!number_is_immediate(fall_exp, 64, 0) ||
number_is_unknown(fall_exp) ||
!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));
vvp_errors += 1;
}
island = ivl_switch_island(sw);
if (ivl_island_flag_test(island, 0) == 0)
draw_tran_island(island);
nex_a = ivl_switch_a(sw);
assert(nex_a);
str_a = draw_island_net_input(island, nex_a);
nex_b = ivl_switch_b(sw);
assert(nex_b);
str_b = draw_island_net_input(island, nex_b);
enable = ivl_switch_enable(sw);
str_e = 0;
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);
snprintf(str_e_buf, sizeof str_e_buf, "p%p", sw);
str_e = str_e_buf;
fprintf(vvp_out, "%s/d .delay 1 "
"(%" PRIu64 ",%" PRIu64 ",%" PRIu64 ") %s;\n",
str_e, get_number_immediate64(rise_exp),
get_number_immediate64(fall_exp),
get_number_immediate64(decay_exp), raw);
fprintf(vvp_out, "%s .import I%p, %s/d;\n", str_e, island, str_e);
} else if (enable) {
str_e = draw_island_net_input(island, enable);
}
switch (ivl_switch_type(sw)) {
case IVL_SW_TRAN:
fprintf(vvp_out, " .tran");
break;
case IVL_SW_TRANIF0:
fprintf(vvp_out, " .tranif0");
break;
case IVL_SW_TRANIF1:
fprintf(vvp_out, " .tranif1");
break;
case IVL_SW_TRAN_VP:
fprintf(vvp_out, " .tranvp %u %u %u,",
ivl_switch_width(sw), ivl_switch_part(sw), ivl_switch_offset(sw));
break;
default:
fprintf(stderr, "%s:%u: tgt-vvp sorry: resistive switch modeling "
"is not currently supported.\n",
ivl_switch_file(sw), ivl_switch_lineno(sw));
vvp_errors += 1;
return;
}
fprintf(vvp_out, " I%p, %s %s", island, str_a, str_b);
if (enable) {
fprintf(vvp_out, ", %s", str_e);
}
fprintf(vvp_out, ";\n");
}
