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Draw PULLUP constants with their own BUFZ. 

This doesn't have any significant runtime consequence other then
to create a functor that is otherwise stable. But this does connect
to .net nodes more naturally, and gets me a step closer to banning
Cx<> labels as arguments to .net records.
This commit is contained in:
Stephen Williams 2009-09-30 19:48:36 -07:00
parent 92fe0e0fc7
commit e076087320
1 changed files with 15 additions and 4 deletions
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19
tgt-vvp/draw_net_input.c
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@ -285,9 +285,11 @@ static char* draw_net_input_drive(ivl_nexus_t nex, ivl_nexus_ptr_t nptr)
} }
if (lptr && (ivl_logic_type(lptr) == IVL_LO_PULLUP)) { if (lptr && (ivl_logic_type(lptr) == IVL_LO_PULLUP)) {
char*result;
char tmp[32];
if (ivl_nexus_ptr_drive1(nptr) == IVL_DR_STRONG) { if (ivl_nexus_ptr_drive1(nptr) == IVL_DR_STRONG) {
size_t result_len = 5 + ivl_logic_width(lptr); size_t result_len = 5 + ivl_logic_width(lptr);
char*result = malloc(result_len); result = malloc(result_len);
char*dp = result; char*dp = result;
strcpy(dp, "C4<"); strcpy(dp, "C4<");
dp += strlen(dp); dp += strlen(dp);
@ -296,11 +298,11 @@ static char* draw_net_input_drive(ivl_nexus_t nex, ivl_nexus_ptr_t nptr)
*dp++ = '>'; *dp++ = '>';
*dp = 0; *dp = 0;
assert((dp-result) <= result_len); assert((dp-result) <= result_len);
return result;
} else { } else {
char val[4]; char val[4];
size_t result_len = 5 + 3*ivl_logic_width(lptr); size_t result_len = 5 + 3*ivl_logic_width(lptr);
char*result = malloc(result_len); result = malloc(result_len);
char*dp = result; char*dp = result;
val[0] = "01234567"[ivl_nexus_ptr_drive0(nptr)]; val[0] = "01234567"[ivl_nexus_ptr_drive0(nptr)];
@ -315,8 +317,17 @@ static char* draw_net_input_drive(ivl_nexus_t nex, ivl_nexus_ptr_t nptr)
*dp++ = '>'; *dp++ = '>';
*dp = 0; *dp = 0;
assert((dp-result) <= result_len); assert((dp-result) <= result_len);
return result;
} }
/* Make the constant an argument to a BUFZ, which is
what we use to drive the PULLed value. */
fprintf(vvp_out, "L_%p .functor BUFZ 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)) { if (lptr && (nptr_pin == 0)) {