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Extended the "maxwidth" DRC rule to take an optional set of layers

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that exclude the maxwidth rule from taking effect.  This is
especially useful for implementing a maxwidth rule on top metal
that does not apply to pads, using the passivation cut layer to
prevent the maxwidth rule from being applied.
This commit is contained in:
R. Timothy Edwards
2025-10-30 16:39:54 -04:00
parent 47778971ee
commit 246c0ea7a4
2 changed files with 89 additions and 8 deletions
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drc/DRCtech.c
+42 -7
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@@ -1061,7 +1061,7 @@ DRCTechAddRule(sectionName, argc, argv)
"layers area horizon why"},
{"off_grid", 4, 4, drcOffGrid,
"layers pitch why"},
{"maxwidth", 4, 5, drcMaxwidth,
{"maxwidth", 4, 6, drcMaxwidth,
"layers maxwidth bends why"},
{"cifstyle", 2, 2, drcCifSetStyle,
"cif_style"},
@@ -1582,7 +1582,7 @@ drcOffGrid(argc, argv)
* Process a maxwidth rule.
* This is of the form:
*
* maxwidth layers distance [bends] why
* maxwidth layers distance [bends] [exclude_layers] why
*
* This routine was updated 3/6/05 to match the "canonical" definition of
* a maxwidth region, which is any rectangle containing <layers> that is
@@ -1591,6 +1591,11 @@ drcOffGrid(argc, argv)
* (see below) for backwards-compatibility. Otherwise ("bend_ok" or
* nothing), the new routine is used.
*
* exclude_layers is optional and indicates a type or types (which if more
* than one must all be on the same plane) that prevent "maxwidth" from
* being checked. A common use case is using "glass" (passivation cut) to
* exclude top metal on a pad from being checked for maximum metal width.
*
* maxwidth metal1 389 "metal1 width > 35um must be slotted"
* maxwidth pmc 4 bend_illegal "poly contact area must be no wider than 4"
* maxwidth trench 4 bend_ok "trench width must be exactly 4"
@@ -1629,11 +1634,11 @@ drcMaxwidth(argc, argv)
int distance = atoi(argv[2]);
char *bends = argv[3];
int why;
TileTypeBitMask set, setC;
TileTypeBitMask set, setC, setE;
DRCCookie *dp, *dpnew;
TileType i, j;
PlaneMask pmask, ptest, pset;
int plane;
PlaneMask pmask, pmask2, ptest, pset;
int plane, plane2;
int bend;
ptest = DBTechNoisyNameMask(layers, &set);
@@ -1667,8 +1672,34 @@ drcMaxwidth(argc, argv)
TechError("unknown bend option %s\n",bends);
return (0);
}
why = drcWhyCreate(argv[4]);
if (argc == 6)
why = drcWhyCreate(argv[5]);
else
why = drcWhyCreate(argv[4]);
}
if (argc == 6)
{
ptest = DBTechNoisyNameMask(argv[4], &setE);
pmask2 = CoincidentPlanes(&setE, ptest);
if (pmask2 == 0)
{
TechError("All layers for \"maxwidth\" exclude types must "
"be on same plane.\n");
return (0);
}
else
{
for (plane2 = PL_TECHDEPBASE; plane2 < DBNumPlanes; plane2++)
if (PlaneMaskHasPlane(pmask2, plane2))
break;
if (plane2 == plane)
TechError("Warning: Exclude types for \"maxwidth\" are on the "
"same plane and so cannot be checked.\n");
}
}
else
plane2 = -1;
for (i = 0; i < DBNumTypes; i++)
{
@@ -1689,8 +1720,12 @@ drcMaxwidth(argc, argv)
/* find bucket preceding the new one we wish to insert */
dp = drcFindBucket(i, j, distance);
dpnew = (DRCCookie *) mallocMagic(sizeof (DRCCookie));
drcAssign(dpnew, distance, dp->drcc_next, &set, &set, why,
if (plane2 == -1)
drcAssign(dpnew, distance, dp->drcc_next, &set, &set, why,
distance, DRC_MAXWIDTH | bend, plane, plane);
else
drcAssign(dpnew, distance, dp->drcc_next, &set, &setE, why,
distance, DRC_MAXWIDTH | bend, plane2, plane);
dp->drcc_next = dpnew;
}