/* * ExtCouple.c -- * * Circuit extraction. * Extraction of coupling capacitance. * * ********************************************************************* * * Copyright (C) 1985, 1990 Regents of the University of California. * * * Permission to use, copy, modify, and distribute this * * * software and its documentation for any purpose and without * * * fee is hereby granted, provided that the above copyright * * * notice appear in all copies. The University of California * * * makes no representations about the suitability of this * * * software for any purpose. It is provided "as is" without * * * express or implied warranty. Export of this software outside * * * of the United States of America may require an export license. * * ********************************************************************* */ #ifndef lint static char rcsid[] __attribute__ ((unused)) = "$Header: /usr/cvsroot/magic-8.0/extract/ExtCouple.c,v 1.2 2010/06/24 12:37:17 tim Exp $"; #endif /* not lint */ #include #include /* For atan() */ #include "utils/magic.h" #include "utils/geometry.h" #include "utils/geofast.h" #include "tiles/tile.h" #include "utils/hash.h" #include "database/database.h" #include "extract/extract.h" #include "extract/extractInt.h" #include "textio/textio.h" /* --------------------- Data local to this file ---------------------- */ /* Pointer to hash table currently being updated with coupling capacitance */ HashTable *extCoupleHashPtr; /* Clipping area for coupling searches */ Rect *extCoupleSearchArea; /* Def being processed */ CellDef *extOverlapDef; /* Forward procedure declarations */ int extBasicOverlap(), extBasicCouple(); int extAddOverlap(), extAddCouple(); int extSideLeft(), extSideRight(), extSideBottom(), extSideTop(); int extWalkLeft(), extWalkRight(), extWalkBottom(), extWalkTop(); int extSideOverlap(), extSideOverlapHalo(), extFindOverlap(); void extSideCommon(); /* Structure to pass on to the coupling and sidewall capacitance */ /* routines to include the current cell definition and the current */ /* plane being searched. */ typedef struct _ecs { CellDef *def; int plane; } extCapStruct; /* Structure to pass on two planes to check for coupling and the tile */ /* which is doing the coupling. */ typedef struct _ecpls { Tile *tile; int plane_of_tile; int plane_checked; } extCoupleStruct; /* Structure to pass on two planes to check for coupling and the */ /* boundary which initiated the check. */ typedef struct _esws { Boundary *bp; int plane_of_boundary; int plane_checked; bool fringe_halo; Rect *area; EdgeCap *extCoupleList; /* List of sidewall capacitance rules */ EdgeCap *extOverlapList; /* List of overlap capacitance rules */ CellDef *def; } extSidewallStruct; /* --------------------- Debugging stuff ---------------------- */ #define CAP_DEBUG FALSE void extNregAdjustCap(nr, c, str) NodeRegion *nr; CapValue c; char *str; { char *name; name = extNodeName((LabRegion *) nr); fprintf(stderr, "CapDebug: %s += %f (%s)\n", name, c, str); } void extAdjustCouple(he, c, str) HashEntry *he; CapValue c; char *str; { char *name1; char *name2; CoupleKey *ck; ck = (CoupleKey *) he->h_key.h_words; name1 = extNodeName((LabRegion *) ck->ck_1); name2 = extNodeName((LabRegion *) ck->ck_2); fprintf(stderr, "CapDebug: %s-%s += %f (%s)\n", name1, name2, c, str); } /* * ---------------------------------------------------------------------------- * * extFindCoupling -- * * Find the coupling capacitances in the cell def. Such capacitances * arise from three causes: * * Overlap. When two tiles on different planes overlap, they * may have a coupling capacitance proportional to * their areas. If this is so, we subtract the substrate * capacitance of the overlapped type, and add the overlap * capacitance to the coupling hash table. * * Sidewall. When tiles on the same plane are adjacent, they may * have a coupling capacitance proportional to the * length of their edges, divided by the distance between * them. In this case, we just add the sidewall coupling * capacitance to the hash table. * * Sidewall * overlap. When the edge of a tile on one plane overlaps a tile * on a different plane, the two tiles may have a coupling * capacitance proportional to the length of the overlapping * edge. In this case we add the coupling capacitance to the * hash table. (We may want to deduct the perimeter capacitance * to substrate?). * * Requires that ExtFindRegions has been run on 'def' to label all its * tiles with NodeRegions. Also requires that the HashTable 'table' * has been initialized by the caller. * * If 'clipArea' is non-NULL, search for overlap capacitance only inside * the area *clipArea. Search for sidewall capacitance only from tiles * inside *clipArea, although this capacitance may be to tiles outside * *clipArea. * * Results: * None. * * Side effects: * When done, the HashTable 'table' will have been filled * in with an entry for each pair of nodes having coupling * capacitance. Each entry will have a two-word key organized * as an CoupleKey struct, with ck_1 and ck_2 pointing to the * coupled nodes. The value of the hash entry will be the * coupling capacitance between that pair of nodes. * * ---------------------------------------------------------------------------- */ void extFindCoupling(def, table, clipArea) CellDef *def; HashTable *table; Rect *clipArea; { const Rect *searchArea; int pNum; extCapStruct ecs; ecs.def = def; extCoupleHashPtr = table; extCoupleSearchArea = clipArea; searchArea = clipArea ? clipArea : &TiPlaneRect; for (pNum = PL_TECHDEPBASE; pNum < DBNumPlanes; pNum++) { ecs.plane = pNum; if (PlaneMaskHasPlane(ExtCurStyle->exts_overlapPlanes, pNum)) (void) DBSrPaintArea((Tile *) NULL, def->cd_planes[pNum], searchArea, &ExtCurStyle->exts_overlapTypes[pNum], extBasicOverlap, (ClientData) &ecs); if (PlaneMaskHasPlane(ExtCurStyle->exts_sidePlanes, pNum)) (void) DBSrPaintArea((Tile *) NULL, def->cd_planes[pNum], searchArea, &ExtCurStyle->exts_sideTypes[pNum], extBasicCouple, (ClientData) &ecs); } } /* * ---------------------------------------------------------------------------- * * extRelocateSubstrateCoupling --- * * Move coupling capacitance to the substrate node from the coupling * cap table onto the source node's cap-to-substrate record. * * ---------------------------------------------------------------------------- */ void extRelocateSubstrateCoupling(table, subsnode) HashTable *table; /* Coupling capacitance hash table */ NodeRegion *subsnode; /* Node record for substrate */ { HashEntry *he; CoupleKey *ck; HashSearch hs; CapValue cap; NodeRegion *rtp; NodeRegion *rbp; HashStartSearch(&hs); while ((he = HashNext(table, &hs))) { cap = extGetCapValue(he); if (cap == 0) continue; ck = (CoupleKey *) he->h_key.h_words; rtp = (NodeRegion *) ck->ck_1; rbp = (NodeRegion *) ck->ck_2; if (rtp == subsnode) { rbp->nreg_cap += cap; extSetCapValue(he, (CapValue)0); } else if (rbp == subsnode) { rtp->nreg_cap += cap; extSetCapValue(he, (CapValue)0); } } } /* * ---------------------------------------------------------------------------- * * extOutputCoupling -- * * Output the coupling capacitance table built up by extFindCoupling(). * Each entry in the hash table is a capacitance between the pair of * nodes identified by he->h_key, an CoupleKey struct. * * ExtFindRegions and ExtLabelRegions should have been called prior * to this procedure. * * Results: * None. * * Side effects: * See the comments above. * * ---------------------------------------------------------------------------- */ void extOutputCoupling(table, outFile) HashTable *table; /* Coupling capacitance hash table */ FILE *outFile; /* Output file */ { HashEntry *he; CoupleKey *ck; HashSearch hs; char *text; CapValue cap; /* value of capacitance. */ HashStartSearch(&hs); while ((he = HashNext(table, &hs))) { cap = extGetCapValue(he) / ExtCurStyle->exts_capScale; if (cap == 0) continue; ck = (CoupleKey *) he->h_key.h_words; text = extNodeName((LabRegion *) ck->ck_1); fprintf(outFile, "cap \"%s\" ", text); text = extNodeName((LabRegion *) ck->ck_2); fprintf(outFile, "\"%s\" %lg\n", text, cap); } } /* * ---------------------------------------------------------------------------- * * extBasicOverlap -- * * Filter function for overlap capacitance. * Called for each tile that might have coupling capacitance * to another node because it overlaps a tile or tiles in that * node. Causes an area search over the area of 'tile' in all * planes to which 'tile' has overlap capacitance, for any tiles * to which 'tile' has overlap capacitance. * * Results: * Returns 0 to keep DBSrPaintArea() going. * * Side effects: * See extAddOverlap(). * * ---------------------------------------------------------------------------- */ int extBasicOverlap(tile, ecs) Tile *tile; extCapStruct *ecs; { int thisType; int pNum; PlaneMask pMask; TileTypeBitMask *tMask; Rect r; CellDef *def = ecs->def; int thisPlane = ecs->plane; extCoupleStruct ecpls; if (IsSplit(tile)) thisType = (SplitSide(tile)) ? SplitRightType(tile) : SplitLeftType(tile); else thisType = TiGetTypeExact(tile); if (DBIsContact(thisType)) thisType = DBPlaneToResidue(thisType, thisPlane); pMask = ExtCurStyle->exts_overlapOtherPlanes[thisType]; tMask = &ExtCurStyle->exts_overlapOtherTypes[thisType]; TITORECT(tile, &r); extOverlapDef = def; if (extCoupleSearchArea) { GEOCLIP(&r, extCoupleSearchArea); } ecpls.tile = tile; ecpls.plane_of_tile = thisPlane; for (pNum = PL_TECHDEPBASE; pNum < DBNumPlanes; pNum++) { /* Skip if nothing interesting on the other plane */ if (pNum == thisPlane || !PlaneMaskHasPlane(pMask, pNum)) continue; ecpls.plane_checked = pNum; (void) DBSrPaintArea((Tile *) NULL, def->cd_planes[pNum], &r, tMask, extAddOverlap, (ClientData) &ecpls); } return (0); } /* * ---------------------------------------------------------------------------- * * extAddOverlap -- * * We are called for each tile that is overlapped by the tile passed to * extBasicOverlap() above (our argument 'tabove'). The intent is that * 'tbelow' actually shields 'tabove' from the substrate, so we should * replace node(tabove)'s capacitance to substrate with a capacitance * to node(tbelow) whose size is proportional to the area of the overlap. * * We check to insure that tabove is not shielded from tbelow by any * intervening material; if it is, we deduct the capacitance between * node(tabove) and node(tbelow) for the area of the overlap. * * Results: * Returns 0 to keep DBSrPaintArea() going. * * Side effects: * Updates the HashEntry with key node(tbelow), node(tabove) * by adding the capacitance of the overlap if node(tbelow) * and node(tabove) are different, and if they are not totally * shielded by intervening material. Also subtracts the capacitance * to substrate from node(tabove) for the area of the overlap. * If node(tbelow) and node(tabove) are the same, we do nothing. * * ---------------------------------------------------------------------------- */ struct overlap { Rect o_clip; int o_area; PlaneMask o_pmask; TileTypeBitMask o_tmask; }; struct sideoverlap { Rect so_clip; double so_coupfrac; double so_subfrac; int so_length; extSidewallStruct *so_esws; PlaneMask so_pmask; TileTypeBitMask so_tmask; TileType so_ctype; }; int extAddOverlap(tbelow, ecpls) Tile *tbelow; extCoupleStruct *ecpls; { int extSubtractOverlap(), extSubtractOverlap2(); NodeRegion *rabove, *rbelow; HashEntry *he; struct overlap ov; TileType ta, tb; CoupleKey ck; int pNum; CapValue c; Tile *tabove = ecpls->tile; /* Check if both tiles are connected. If they are, we don't need */ /* to check for shielding material, and we don't want to add any */ /* coupling capacitance between them. However, we *do* want to */ /* subtract off any substrate (area) capacitance previously added */ /* (Correction made 4/29/04 by Tim from a tip by Jeff Sondeen). */ rabove = (NodeRegion *) extGetRegion(tabove); rbelow = (NodeRegion *) extGetRegion(tbelow); /* Quick check on validity of tile's ti_client record */ if (rbelow == (NodeRegion *)CLIENTDEFAULT) return 0; if (rabove == (NodeRegion *)CLIENTDEFAULT) return 0; /* Compute the area of overlap */ ov.o_clip.r_xbot = MAX(LEFT(tbelow), LEFT(tabove)); ov.o_clip.r_xtop = MIN(RIGHT(tbelow), RIGHT(tabove)); ov.o_clip.r_ybot = MAX(BOTTOM(tbelow), BOTTOM(tabove)); ov.o_clip.r_ytop = MIN(TOP(tbelow), TOP(tabove)); if (extCoupleSearchArea) { GEOCLIP(&ov.o_clip, extCoupleSearchArea); } ov.o_area = (ov.o_clip.r_ytop - ov.o_clip.r_ybot) * (ov.o_clip.r_xtop - ov.o_clip.r_xbot); ta = TiGetType(tabove); tb = TiGetType(tbelow); /* Revert any contacts to their residues */ if (DBIsContact(ta)) ta = DBPlaneToResidue(ta, ecpls->plane_of_tile); if (DBIsContact(tb)) tb = DBPlaneToResidue(tb, ecpls->plane_checked); /* * Find whether rabove and rbelow are shielded by intervening material. * Deduct the area shielded from the area of the overlap, so we adjust * the overlap capacitance correspondingly. */ if ((ov.o_pmask = ExtCurStyle->exts_overlapShieldPlanes[ta][tb])) { ov.o_tmask = ExtCurStyle->exts_overlapShieldTypes[ta][tb]; for (pNum = PL_TECHDEPBASE; pNum < DBNumPlanes; pNum++) { if (!PlaneMaskHasPlane(ov.o_pmask, pNum)) continue; ov.o_pmask &= ~(PlaneNumToMaskBit(pNum)); if (ov.o_pmask == 0) { (void) DBSrPaintArea((Tile *) NULL, extOverlapDef->cd_planes[pNum], &ov.o_clip, &ov.o_tmask, extSubtractOverlap, (ClientData) &ov); } else { (void) DBSrPaintArea((Tile *) NULL, extOverlapDef->cd_planes[pNum], &ov.o_clip, &DBAllTypeBits, extSubtractOverlap2, (ClientData) &ov); } break; } } /* If any capacitance remains, add this record to the table */ if (ov.o_area > 0) { int oa = ExtCurStyle->exts_planeOrder[ecpls->plane_of_tile]; int ob = ExtCurStyle->exts_planeOrder[ecpls->plane_checked]; if (oa > ob) { Tile *tp; TileType t, tres; TileTypeBitMask *mask; int len; CapValue cp; /* * Subtract the substrate capacitance from tabove's region due to * the area of the overlap, minus any shielded area. The shielded * areas get handled later, when processing coupling between tabove * and the shielding tile. (Tabove was the overlapping tile, so it * is shielded from the substrate by tbelow if the Tabove plane is * above the Tbelow plane). */ rabove->nreg_cap -= ExtCurStyle->exts_areaCap[ta] * ov.o_area; if (CAP_DEBUG) extNregAdjustCap(rabove, -(ExtCurStyle->exts_areaCap[ta] * ov.o_area), "obsolete_overlap"); } else if (CAP_DEBUG) extNregAdjustCap(rabove, 0.0, "obsolete_overlap (skipped, wrong direction)"); /* If the regions are the same, skip this part */ if (rabove == rbelow) return (0); /* Find the coupling hash record */ if (rabove < rbelow) ck.ck_1 = rabove, ck.ck_2 = rbelow; else ck.ck_1 = rbelow, ck.ck_2 = rabove; he = HashFind(extCoupleHashPtr, (char *) &ck); /* Add the overlap capacitance to the table */ c = extGetCapValue(he); c += ExtCurStyle->exts_overlapCap[ta][tb] * ov.o_area; if (CAP_DEBUG) extAdjustCouple(he, ExtCurStyle->exts_overlapCap[ta][tb] * ov.o_area, "overlap"); extSetCapValue(he, c); } return (0); } /* Simple overlap. The area of overlap is subtracted from ov->o_area */ int extSubtractOverlap(tile, ov) Tile *tile; struct overlap *ov; { Rect r; int area; TITORECT(tile, &r); GEOCLIP(&r, &ov->o_clip); area = (r.r_xtop - r.r_xbot) * (r.r_ytop - r.r_ybot); if (area > 0) ov->o_area -= area; return (0); } /* Recursive shielding overlap check. If the tile shields, */ /* then the area of overlap is subtracted from ov->o_area. If */ /* not, then this routine is called recursively on the next */ /* shielding plane. */ int extSubtractOverlap2(tile, ov) Tile *tile; struct overlap *ov; { struct overlap ovnew; int area, pNum; Rect r; TITORECT(tile, &r); GEOCLIP(&r, &ov->o_clip); area = (r.r_xtop - r.r_xbot) * (r.r_ytop - r.r_ybot); if (area <= 0) return (0); /* This tile shields everything below */ if (TTMaskHasType(&ov->o_tmask, TiGetType(tile))) { ov->o_area -= area; return (0); } /* Tile doesn't shield, so search next plane */ ovnew = *ov; ovnew.o_clip = r; for (pNum = PL_TECHDEPBASE; pNum < DBNumPlanes; pNum++) { if (!PlaneMaskHasPlane(ovnew.o_pmask, pNum)) continue; ovnew.o_pmask &= ~(PlaneNumToMaskBit(pNum)); if (ovnew.o_pmask == 0) { (void) DBSrPaintArea((Tile *) NULL, extOverlapDef->cd_planes[pNum], &ovnew.o_clip, &ovnew.o_tmask, extSubtractOverlap, (ClientData) &ovnew); } else { (void) DBSrPaintArea((Tile *) NULL, extOverlapDef->cd_planes[pNum], &ovnew.o_clip, &DBAllTypeBits, extSubtractOverlap2, (ClientData) &ovnew); } break; } ov->o_area = ovnew.o_area; return (0); } /* Side overlap shielding. The fraction of the side overlap (fringe) * capacitance over this area is added to ov->o_frac, so that it can * be subtracted from the total. */ int extSubtractSideOverlap(tile, sov) Tile *tile; struct sideoverlap *sov; { Rect r; int area, dnear, dfar, length; double mult, snear, sfar; TileType ta, tb; Boundary *bp = sov->so_esws->bp; TITORECT(tile, &r); GEOCLIP(&r, &sov->so_clip); area = (r.r_xtop - r.r_xbot) * (r.r_ytop - r.r_ybot); if (area <= 0) return 0; ta = TiGetType(bp->b_inside); tb = sov->so_ctype; if (bp->b_segment.r_xtop == bp->b_segment.r_xbot) length = r.r_ytop - r.r_ybot; else length = r.r_xtop - r.r_xbot; switch (bp->b_direction) { case BD_LEFT: /* Tile tp is to the left of the boundary */ dnear = bp->b_segment.r_xbot - r.r_xtop; dfar = bp->b_segment.r_xbot - r.r_xbot; break; case BD_RIGHT: /* Tile tp is to the right of the boundary */ dnear = r.r_xbot - bp->b_segment.r_xtop; dfar = r.r_xtop - bp->b_segment.r_xtop; break; case BD_BOTTOM: /* Tile tp is below the boundary */ dnear = bp->b_segment.r_ybot - r.r_ytop; dfar = bp->b_segment.r_ybot - r.r_ybot; break; case BD_TOP: /* Tile tp is above the boundary */ dnear = r.r_ybot - bp->b_segment.r_ytop; dfar = r.r_ytop - bp->b_segment.r_ytop; break; } if (dnear < 0) dnear = 0; /* Don't count underlap */ mult = ExtCurStyle->exts_overlapMult[ta][0]; snear = 0.6366 * atan(mult * dnear); sfar = 0.6366 * atan(mult * dfar); /* "sfar - snear" is the fractional portion of the fringe cap */ /* seen by the substrate in the direction perpendicular to the edge */ /* generating the fringe cap. This is multiplied by the fraction */ /* of the total edge length to get the total fraction of the entire */ /* fringe capacitance being shielded. */ sov->so_subfrac += (sfar - snear) * ((double)length / (double)sov->so_length); /* Do the same calculation but the the overlap multiplier for the */ /* coupling layer, since the fringe capacitance has a different */ /* halo than for the substrate. */ if (ExtCurStyle->exts_overlapMult[ta][tb] != mult) { mult = ExtCurStyle->exts_overlapMult[ta][tb]; snear = 0.6366 * atan(mult * dnear); sfar = 0.6366 * atan(mult * dfar); } sov->so_coupfrac += (sfar - snear) * ((double)length / (double)sov->so_length); return (0); } /* Recursive shielding side overlap check. If the tile shields */ /* then the area of overlap is subtracted from ov->o_area. If */ /* not, then this routine is called recursively on the next */ /* shielding plane. */ int extSubtractSideOverlap2(tile, sov) Tile *tile; struct sideoverlap *sov; { struct sideoverlap sovnew; int area, pNum; Rect r; TITORECT(tile, &r); GEOCLIP(&r, &sov->so_clip); area = (r.r_xtop - r.r_xbot) * (r.r_ytop - r.r_ybot); if (area <= 0) return (0); /* This tile shields everything below */ if (TTMaskHasType(&sov->so_tmask, TiGetType(tile))) { extSubtractSideOverlap(tile, sov); return (0); } /* Tile doesn't shield, so search next plane */ sovnew = *sov; sovnew.so_clip = r; for (pNum = PL_TECHDEPBASE; pNum < DBNumPlanes; pNum++) { if (!PlaneMaskHasPlane(sovnew.so_pmask, pNum)) continue; sovnew.so_pmask &= ~(PlaneNumToMaskBit(pNum)); if (sovnew.so_pmask == 0) { (void) DBSrPaintArea((Tile *) NULL, extOverlapDef->cd_planes[pNum], &sovnew.so_clip, &sovnew.so_tmask, extSubtractSideOverlap, (ClientData) &sovnew); } else { (void) DBSrPaintArea((Tile *) NULL, extOverlapDef->cd_planes[pNum], &sovnew.so_clip, &DBAllTypeBits, extSubtractSideOverlap2, (ClientData) &sovnew); } break; } sov->so_subfrac = sovnew.so_subfrac; sov->so_coupfrac = sovnew.so_coupfrac; return (0); } /* * ---------------------------------------------------------------------------- * * extBasicCouple -- * * Filter function for sidewall coupling capacitance. * Called for each tile that might have coupling capacitance * to another node because it is near tiles on the same plane, * or because its edge overlaps tiles on a different plane. * * Causes an area search over a halo surrounding each edge of * 'tile' for edges to which each edge has coupling capacitance * on this plane, and a search for tiles on different planes that * this edge overlaps. * * Results: * Returns 0 to keep DBSrPaintArea() going. * * Side effects: * See extAddCouple(). * * ---------------------------------------------------------------------------- */ int extBasicCouple(tile, ecs) Tile *tile; extCapStruct *ecs; { (void) extEnumTilePerim(tile, &ExtCurStyle->exts_sideEdges[TiGetType(tile)], ecs->plane, extAddCouple, (ClientData) ecs); return (0); } /* * ---------------------------------------------------------------------------- * * extAddCouple -- * * Called for each segment along the boundary of the tile bp->b_inside * that might have coupling capacitance with its neighbors. * Causes an area search over a halo surrounding the boundary bp->b_segment * on the side outside bp->b_inside for edges to which this one has coupling * capacitance on this plane, and for tiles overlapping this edge on different * planes. * * Results: * Returns 0 to keep DBSrPaintArea() going. * * Side effects: * For each edge (tnear, tfar) we find that has coupling capacitance * to us, update the HashEntry with key node(bp->b_inside), node(tfar) * by adding the sidewall capacitance if node(bp->b_inside) and node(tfar) * are different. If node(bp->b_inside) and node(tfar) are the same, we * do nothing. * * For each tile tp we find on a different plane that overlaps this * edge, update the HashEntry with key node(bp->b_inside), node(tp) * by adding the sidewall overlap capacitance. If node(bp->b_inside) * and node(tp) are the same, do nothing. * * ---------------------------------------------------------------------------- */ int extAddCouple(bp, ecs) Boundary *bp; /* Boundary being considered */ extCapStruct *ecs; { TileType tin = TiGetType(bp->b_inside), tout = TiGetType(bp->b_outside); int pNum; PlaneMask pMask; Boundary bpCopy; Rect r, ovr; extSidewallStruct esws; int distFringe; /* Check here for a zero exts_sideCoupleOtherEdges mask. * that handles cases such as FET types not being declared in * defaultperimeter, as the edge between poly and FET will be * seen as a boundary. The lack of any area coupling should * then prevent it from being checked for fringe cap. */ if (TTMaskIsZero(&ExtCurStyle->exts_sideCoupleOtherEdges[tin][tout])) return 0; /* Revert any edge contacts to their residues */ if (DBIsContact(tin)) tin = DBPlaneToResidue(tin, ecs->plane); if (DBIsContact(tout)) tout = DBPlaneToResidue(tout, ecs->plane); esws.extCoupleList = ExtCurStyle->exts_sideCoupleCap[tin][tout]; esws.extOverlapList = ExtCurStyle->exts_sideOverlapCap[tin][tout]; if ((esws.extCoupleList == NULL) && (esws.extOverlapList == NULL)) return (0); esws.def = ecs->def; /* * Clip the edge of interest to the area where we're searching * for coupling capacitance, if such an area has been specified. */ if (extCoupleSearchArea) { bpCopy = *bp; bp = &bpCopy; if (!GEO_OVERLAP(&bp->b_segment, extCoupleSearchArea)) return 0; GEOCLIP(&bp->b_segment, extCoupleSearchArea); } r = ovr = bp->b_segment; /* If considering fringe capacitance to be distributed over */ /* a halo surrounding the edge of a shape, then set the */ /* fringe distance to the halo value. Otherwise, the */ /* fringe cap is (unrealistically) assumed to couple only */ /* to shapes that are directly below the edge. */ esws.fringe_halo = (ExtOptions & EXT_DOFRINGEHALO) ? ((ExtCurStyle->exts_sideCoupleHalo == 0) ? FALSE : TRUE) : FALSE; distFringe = (ExtOptions & EXT_DOFRINGEHALO) ? ExtCurStyle->exts_sideCoupleHalo : 1; if (distFringe == 0) distFringe = 1; esws.bp = bp; esws.plane_of_boundary = ecs->plane; esws.area = &ovr; switch (bp->b_direction) { case BD_LEFT: /* Along left */ r.r_xbot -= ExtCurStyle->exts_sideCoupleHalo; ovr.r_xbot -= distFringe; extWalkLeft(&r, &ExtCurStyle->exts_sideCoupleOtherEdges[tin][tout], extSideLeft, bp, &esws); break; case BD_RIGHT: /* Along right */ r.r_xtop += ExtCurStyle->exts_sideCoupleHalo; ovr.r_xtop += distFringe; extWalkRight(&r, &ExtCurStyle->exts_sideCoupleOtherEdges[tin][tout], extSideRight, bp, &esws); break; case BD_TOP: /* Along top */ r.r_ytop += ExtCurStyle->exts_sideCoupleHalo; ovr.r_ytop += distFringe; extWalkTop(&r, &ExtCurStyle->exts_sideCoupleOtherEdges[tin][tout], extSideTop, bp, &esws); break; case BD_BOTTOM: /* Along bottom */ r.r_ybot -= ExtCurStyle->exts_sideCoupleHalo; ovr.r_ybot -= distFringe; extWalkBottom(&r, &ExtCurStyle->exts_sideCoupleOtherEdges[tin][tout], extSideBottom, bp, &esws); break; } return (0); } /* * ---------------------------------------------------------------------------- * * extRemoveSubcap -- * * A nearby shape blocks parasitic fringe capacitance from a layer boundary * to substrate, and so all parasitic fringe capacitance from the layer's * region to substrate that is blocked must be removed from the total * substrate capacitance for that region. * * ---------------------------------------------------------------------------- */ void extRemoveSubcap(bp, clip, esws) Boundary *bp; /* Boundary with fringe capacitance */ Rect *clip; /* Area not being blocked */ extSidewallStruct *esws; /* Overlapping edge and plane information */ { int dnear, length; double snear, cfrac; NodeRegion *rbp; TileType ta, tb; float mult; CapValue subcap; if (!esws->fringe_halo) return; ta = TiGetType(bp->b_inside); tb = TiGetType(bp->b_outside); rbp = (NodeRegion *)extGetRegion(bp->b_inside); if (bp->b_segment.r_xtop == bp->b_segment.r_xbot) length = bp->b_segment.r_ytop - bp->b_segment.r_ybot; else length = bp->b_segment.r_xtop - bp->b_segment.r_xbot; switch (bp->b_direction) { case BD_LEFT: /* Tile tp is to the left of the boundary */ dnear = bp->b_segment.r_xbot - clip->r_xbot; break; case BD_RIGHT: /* Tile tp is to the right of the boundary */ dnear = clip->r_xtop - bp->b_segment.r_xtop; break; case BD_BOTTOM: /* Tile tp is below the boundary */ dnear = bp->b_segment.r_ybot - clip->r_ybot; break; case BD_TOP: /* Tile tp is above the boundary */ dnear = clip->r_ytop - bp->b_segment.r_ytop; break; } if (dnear < 0) dnear = 0; /* Don't count underlap */ mult = ExtCurStyle->exts_overlapMult[ta][0]; snear = 0.6366 * atan((double)mult * dnear); /* "snear" is the fractional portion of the fringe cap seen by */ /* the substrate, so (1.0 - snear) is the part that is blocked. */ subcap = ExtCurStyle->exts_perimCap[ta][tb] * (1.0 - snear) * length; rbp->nreg_cap -= subcap; } /* * ---------------------------------------------------------------------------- * * extFindOverlap -- * * Callback function for extWalkTop/Bottom/Right/Left to find the * side overlap (fringe) capacitance from a material edge (held in * esws->bp) and all layers in planes below to which its fringe * capacitance may couple. The area to search will have been reduced * by any nearby layers on the same plane that shield the fringe * capacitance. * * Results: * Returns 0 to keep extWalk*() going. * * Side effects: * See side effects of the called function extSideOverlap() * * ---------------------------------------------------------------------------- */ int extFindOverlap(tp, area, esws) Tile *tp; /* Overlapped tile */ Rect *area; /* Area to check for coupling */ extSidewallStruct *esws; /* Overlapping edge and plane information */ { PlaneMask pMask; int pNum; Rect *rsave; Boundary *bp = esws->bp; TileType tin = TiGetType(bp->b_inside); TileType tout = TiGetType(bp->b_outside); pMask = ExtCurStyle->exts_sideOverlapOtherPlanes[tin][tout]; extOverlapDef = esws->def; /* Replace esws->area with area */ rsave = esws->area; esws->area = area; for (pNum = PL_TECHDEPBASE; pNum < DBNumPlanes; pNum++) if (PlaneMaskHasPlane(pMask, pNum)) { esws->plane_checked = pNum; (void) DBSrPaintArea((Tile *) NULL, esws->def->cd_planes[pNum], area, &ExtCurStyle->exts_sideOverlapOtherTypes[tin][tout], (esws->fringe_halo) ? extSideOverlapHalo : extSideOverlap, (ClientData)esws); } esws->area = rsave; return 0; } /* * ---------------------------------------------------------------------------- * * extSideOverlapHalo -- * * The boundary 'bp' has been found to overlap the tile 'tp', which it * has coupling capacitance to. * * Every tile that couples to an edge is also shielding the substrate * from that edge. To maintain the proper accounting of the amount of * substrate shielded, calculate only for the area of the substrate that * couples to the *unshielded* portion of the tile. The part of the * substrate that is under a shielded portion of the tile will be handled * later when calculating coupling to that shielding tile. * * * Results: * Returns 0 to keep DBSrPaintArea() going. * * Side effects: * Update the coupling capacitance between node(bp->t_inside) and * node(tp) if the two nodes are different. Does so by updating * the value stored in the HashEntry keyed by the two nodes. * * ---------------------------------------------------------------------------- */ int extSideOverlapHalo(tp, esws) Tile *tp; /* Overlapped tile */ extSidewallStruct *esws; /* Overlapping edge and plane information */ { Boundary *bp = esws->bp; /* Overlapping edge */ NodeRegion *rtp = (NodeRegion *) extGetRegion(tp); NodeRegion *rbp = (NodeRegion *) extGetRegion(bp->b_inside); TileType ta, tb; Rect tpr; struct sideoverlap sov; HashEntry *he; EdgeCap *e; int length; double cfrac, sfrac, afrac, mult, efflength; CapValue cap, subcap; CoupleKey ck; int dfar, dnear; double sfar, snear, subfrac; /* Nothing to do for space tiles, so just return. */ /* (TO DO: Make sure TT_SPACE is removed from all exts_sideOverlapOtherTypes */ tb = TiGetType(tp); if (tb == TT_SPACE) return (0); /* Get the area of the coupling tile, and clip to the fringe area */ /* of the tile edge generating the fringe capacitance. */ TITORECT(tp, &sov.so_clip); GEOCLIP(&sov.so_clip, esws->area); /* Calculate the length of the clipped area */ if (bp->b_segment.r_xtop == bp->b_segment.r_xbot) length = sov.so_clip.r_ytop - sov.so_clip.r_ybot; else length = sov.so_clip.r_xtop - sov.so_clip.r_xbot; /* ta is the tile type of the edge generating the fringe cap. */ ta = TiGetType(bp->b_inside); /* Revert any contacts to their residues */ if (DBIsContact(ta)) ta = DBPlaneToResidue(ta, esws->plane_of_boundary); if (DBIsContact(tb)) tb = DBPlaneToResidue(tb, esws->plane_checked); /* Find the fraction of the fringe cap seen by tile tp (depends */ /* on the tile width and distance from the boundary) */ switch (bp->b_direction) { case BD_LEFT: /* Tile tp is to the left of the boundary */ dfar = bp->b_segment.r_ll.p_x - sov.so_clip.r_xbot; dnear = bp->b_segment.r_ll.p_x - sov.so_clip.r_xtop; break; case BD_RIGHT: /* Tile tp is to the right of the boundary */ dfar = sov.so_clip.r_xtop - bp->b_segment.r_ur.p_x; dnear = sov.so_clip.r_xbot - bp->b_segment.r_ur.p_x; break; case BD_BOTTOM: /* Tile tp is below the boundary */ dfar = bp->b_segment.r_ll.p_y - sov.so_clip.r_ybot; dnear = bp->b_segment.r_ll.p_y - sov.so_clip.r_ytop; break; case BD_TOP: /* Tile tp is above the boundary */ dfar = sov.so_clip.r_ytop - bp->b_segment.r_ur.p_y; dnear = sov.so_clip.r_ybot - bp->b_segment.r_ur.p_y; break; } if (dnear < 0) dnear = 0; /* Don't count underlap */ mult = ExtCurStyle->exts_overlapMult[ta][tb]; sfar = 0.6366 * atan(mult * dfar); snear = 0.6366 * atan(mult * dnear); /* "cfrac" is the fractional portion of the fringe cap seen */ /* by tile tp along its length. This is independent of the */ /* portion of the boundary length that tile tp occupies. */ cfrac = sfar - snear; /* The fringe portion extracted from the substrate will be */ /* different than the portion added to the coupling layer. */ if (ExtCurStyle->exts_overlapMult[ta][0] != mult) { mult = ExtCurStyle->exts_overlapMult[ta][0]; sfar = 0.6366 * atan(mult * dfar); snear = 0.6366 * atan(mult * dnear); } sfrac = sfar - snear; /* Apply each rule, incorporating shielding into the edge length. */ cap = subcap = (CapValue) 0; subfrac = 0.0; for (e = esws->extOverlapList; e; e = e->ec_next) { /* Only apply rules for the plane in which they are declared */ if (!PlaneMaskHasPlane(e->ec_pmask, esws->plane_checked)) continue; /* Does this rule "e" include the tile we found? */ if (TTMaskHasType(&e->ec_near, TiGetType(tp))) { /* We have a possible capacitor, but are the tiles shielded from * each other part of the way? */ int pNum; sov.so_pmask = ExtCurStyle->exts_sideOverlapShieldPlanes[ta][tb]; sov.so_esws = esws; sov.so_coupfrac = (double)0.0; sov.so_subfrac = (double)0.0; sov.so_length = length; sov.so_ctype = tb; if (sov.so_pmask) { sov.so_tmask = e->ec_far; /* Actually shieldtypes. */ for (pNum = PL_TECHDEPBASE; pNum < DBNumPlanes; pNum++) { /* Each call to DBSrPaintArea has an opportunity to * subtract a partial capacitance from the total. */ if (!PlaneMaskHasPlane(sov.so_pmask, pNum)) continue; sov.so_pmask &= ~(PlaneNumToMaskBit(pNum)); if (sov.so_pmask == 0) { (void) DBSrPaintArea((Tile *) NULL, extOverlapDef->cd_planes[pNum], &sov.so_clip, &sov.so_tmask, extSubtractSideOverlap, (ClientData) &sov); } else { (void) DBSrPaintArea((Tile *) NULL, extOverlapDef->cd_planes[pNum], &sov.so_clip, &DBAllTypeBits, extSubtractSideOverlap2, (ClientData) &sov); } break; } } if (rtp != rbp) { efflength = (cfrac - sov.so_coupfrac) * (double)length; cap += e->ec_cap * efflength; subfrac += sov.so_subfrac; /* Just add the shielded fraction */ } } } /* Add in the new capacitance. */ if (tb != TT_SPACE) { int oa = ExtCurStyle->exts_planeOrder[esws->plane_of_boundary]; int ob = ExtCurStyle->exts_planeOrder[esws->plane_checked]; if (oa > ob) { /* If the overlapped tile is between the substrate and the boundary * tile, then we subtract the fringe substrate capacitance * from rbp's region due to the area of the sideoverlap, since * we now know it is shielded from the substrate. */ TileType outtype = TiGetType(bp->b_outside); /* Decompose contacts into their residues */ if (DBIsContact(ta)) ta = DBPlaneToResidue(ta, esws->plane_of_boundary); if (DBIsContact(outtype)) outtype = DBPlaneToResidue(outtype, esws->plane_of_boundary); efflength = (sfrac - subfrac) * (double)length; subcap = ExtCurStyle->exts_perimCap[ta][0] * efflength; rbp->nreg_cap -= subcap; /* Ignore residual error at ~zero zeptoFarads. Probably */ /* there should be better handling of round-off here. */ if ((rbp->nreg_cap > -0.001) && (rbp->nreg_cap < 0.001)) rbp->nreg_cap = 0; if (CAP_DEBUG) extNregAdjustCap(rbp, -subcap, "obsolete_perimcap"); } else if (CAP_DEBUG) extNregAdjustCap(rbp, 0.0, "obsolete_perimcap (skipped, wrong direction)"); /* If the nodes are electrically connected, then we don't add */ /* any side overlap capacitance to the node. */ if (rtp == rbp) return 0; if (rtp == (NodeRegion *)CLIENTDEFAULT) return 0; if (rbp == (NodeRegion *)CLIENTDEFAULT) return 0; if (rtp < rbp) { ck.ck_1 = rtp; ck.ck_2 = rbp; } else { ck.ck_1 = rbp; ck.ck_2 = rtp; } he = HashFind(extCoupleHashPtr, (char *) &ck); if (CAP_DEBUG) extAdjustCouple(he, cap, "sideoverlap"); extSetCapValue(he, cap + extGetCapValue(he)); } return (0); } /* * ---------------------------------------------------------------------------- * * extSideOverlap -- * * The boundary 'bp' has been found to overlap the tile 'tp', which it * has coupling capacitance to. This is legacy behavior when no fringe * halo is considered, but the fringe is modeled as being directed * downward from an edge onto any layer directly below the edge, and * occupying no area. This approximation is generally only reasonable for * processes down to 0.5um or so. * * Results: * Returns 0 to keep DBSrPaintArea() going. * * Side effects: * Update the coupling capacitance between node(bp->t_inside) and * node(tp) if the two nodes are different. Does so by updating * the value stored in the HashEntry keyed by the two nodes. * * ---------------------------------------------------------------------------- */ int extSideOverlap(tp, esws) Tile *tp; /* Overlapped tile */ extSidewallStruct *esws; /* Overlapping edge and plane information */ { Boundary *bp = esws->bp; /* Overlapping edge */ NodeRegion *rtp = (NodeRegion *) extGetRegion(tp); NodeRegion *rbp = (NodeRegion *) extGetRegion(bp->b_inside); TileType ta, tb; Rect tpr; struct overlap ov; HashEntry *he; EdgeCap *e; int length, areaAccountedFor, areaTotal; double afrac; CapValue cap; CoupleKey ck; /* Nothing to do for space tiles, so just return. */ /* (TO DO: Make sure TT_SPACE is removed from all exts_sideOverlapOtherTypes */ tb = TiGetType(tp); if (tb == TT_SPACE) return (0); if (bp->b_segment.r_xtop == bp->b_segment.r_xbot) { length = MIN(bp->b_segment.r_ytop, TOP(tp)) - MAX(bp->b_segment.r_ybot, BOTTOM(tp)); } else { length = MIN(bp->b_segment.r_xtop, RIGHT(tp)) - MAX(bp->b_segment.r_xbot, LEFT(tp)); } TITORECT(tp, &ov.o_clip); GEOCLIP(&ov.o_clip, esws->area); areaTotal = GEO_WIDTH(&ov.o_clip) * GEO_HEIGHT(&ov.o_clip); areaAccountedFor = 0; ta = TiGetType(bp->b_inside); /* Revert any contacts to their residues */ if (DBIsContact(ta)) ta = DBPlaneToResidue(ta, esws->plane_of_boundary); if (DBIsContact(tb)) tb = DBPlaneToResidue(tb, esws->plane_checked); /* Apply each rule, incorporating shielding into the edge length. */ cap = (CapValue) 0; for (e = esws->extOverlapList; e; e = e->ec_next) { /* Only apply rules for the plane in which they are declared */ if (!PlaneMaskHasPlane(e->ec_pmask, esws->plane_checked)) continue; /* Does this rule "e" include the tile we found? */ if (TTMaskHasType(&e->ec_near, TiGetType(tp))) { /* We have a possible capacitor, but are the tiles shielded from * each other part of the way? */ int pNum; ov.o_area = areaTotal; ov.o_pmask = ExtCurStyle->exts_sideOverlapShieldPlanes[ta][tb]; if (ov.o_pmask) { ov.o_tmask = e->ec_far; /* Actually shieldtypes. */ for (pNum = PL_TECHDEPBASE; pNum < DBNumPlanes; pNum++) { /* Each call to DBSrPaintArea has an opportunity to * subtract from the area (really length 'cause width=1). */ if (!PlaneMaskHasPlane(ov.o_pmask, pNum)) continue; ov.o_pmask &= ~(PlaneNumToMaskBit(pNum)); if (ov.o_pmask == 0) { (void) DBSrPaintArea((Tile *) NULL, extOverlapDef->cd_planes[pNum], &ov.o_clip, &ov.o_tmask, extSubtractOverlap, (ClientData) &ov); } else { (void) DBSrPaintArea((Tile *) NULL, extOverlapDef->cd_planes[pNum], &ov.o_clip, &DBAllTypeBits, extSubtractOverlap2, (ClientData) &ov); } break; } } if (rtp != rbp) cap += e->ec_cap * ov.o_area; areaAccountedFor += ov.o_area; } } /* Add in the new capacitance. */ if (tb != TT_SPACE) { int oa = ExtCurStyle->exts_planeOrder[esws->plane_of_boundary]; int ob = ExtCurStyle->exts_planeOrder[esws->plane_checked]; if (oa > ob) { /* If the overlapped tile is between the substrate and the boundary * tile, then we subtract the fringe substrate capacitance * from rbp's region due to the area of the sideoverlap, since * we now know it is shielded from the substrate. */ CapValue subcap; TileType outtype = TiGetType(bp->b_outside); /* Decompose contacts into their residues */ if (DBIsContact(ta)) ta = DBPlaneToResidue(ta, esws->plane_of_boundary); if (DBIsContact(outtype)) outtype = DBPlaneToResidue(outtype, esws->plane_of_boundary); afrac = (double)areaAccountedFor / (double)areaTotal; subcap = (ExtCurStyle->exts_perimCap[ta][outtype] * MIN(areaAccountedFor, length)); rbp->nreg_cap -= subcap; /* Ignore residual error at ~zero zeptoFarads. Probably */ /* there should be better handling of round-off here. */ if ((rbp->nreg_cap > -0.001) && (rbp->nreg_cap < 0.001)) rbp->nreg_cap = 0; if (CAP_DEBUG) extNregAdjustCap(rbp, -subcap, "obsolete_perimcap"); } else if (CAP_DEBUG) extNregAdjustCap(rbp, 0.0, "obsolete_perimcap (skipped, wrong direction)"); /* If the nodes are electrically connected, then we don't add */ /* any side overlap capacitance to the node. */ if (rtp == rbp) return 0; if (rtp == (NodeRegion *)CLIENTDEFAULT) return 0; if (rbp == (NodeRegion *)CLIENTDEFAULT) return 0; if (rtp < rbp) { ck.ck_1 = rtp; ck.ck_2 = rbp; } else { ck.ck_1 = rbp; ck.ck_2 = rtp; } he = HashFind(extCoupleHashPtr, (char *) &ck); if (CAP_DEBUG) extAdjustCouple(he, cap, "sideoverlap"); extSetCapValue(he, cap + extGetCapValue(he)); } return (0); } /* * ---------------------------------------------------------------------------- * * extWalkTop --- * * Search in the area 'area' above the boundary 'bp' for coupling tiles of * types in 'mask', starting from the right corner above the boundary and * sweeping left. If a coupling tile is found, process it, clipping the * boundary to the width of the tile if needed. Then recursively call * extWalkTop on the areas to the left and right sides of the tile with * boundaries reduced to the width of those areas. This way the edge * boundary is subdivided into lengths occupied by the nearest neighbor. * * Return value: * Return 1 if func() returned 1, otherwise return 0. * * Side effects: * None. * * ---------------------------------------------------------------------------- */ int extWalkTop(area, mask, func, bp, esws) Rect *area; TileTypeBitMask *mask; int (*func)(); Boundary *bp; extSidewallStruct *esws; { Tile *tile, *tp; TileType ttype; Boundary bloc; Rect aloc; tile = RT(bp->b_outside); /* Tile above tile on top of the boundary */ while (BOTTOM(tile) < area->r_ytop) { while (LEFT(tile) >= area->r_xtop) tile = BL(tile); /* Walk back to area */ tp = tile; while (RIGHT(tp) > area->r_xbot) { if (IsSplit(tp)) ttype = (SplitSide(tp)) ? SplitRightType(tp) : SplitLeftType(tp); else ttype = TiGetTypeExact(tp); if (TTMaskHasType(mask, ttype)) { bool lookLeft, lookRight; bloc = *bp; /* Copy boundary to bc, then adjust boundary */ lookLeft = (LEFT(tp) > bp->b_segment.r_xbot) ? TRUE : FALSE; lookRight = (RIGHT(tp) < bp->b_segment.r_xtop) ? TRUE : FALSE; if (lookLeft) bloc.b_segment.r_xbot = LEFT(tp); if (lookRight) bloc.b_segment.r_xtop = RIGHT(tp); /* Call sidewall coupling calculation function */ if (func(tp, &bloc, esws) != 0) return 1; /* Clip coupling area and call fringe coupling calculation function */ aloc = *area; aloc.r_ytop = BOTTOM(tp); aloc.r_xbot = bloc.b_segment.r_xbot; aloc.r_xtop = bloc.b_segment.r_xtop; if (extFindOverlap(bp->b_outside, &aloc, esws) != 0) return 1; extRemoveSubcap(&bloc, &aloc, esws); /* Recurse on tile left side */ if (lookLeft) { aloc = *area; aloc.r_xtop = bloc.b_segment.r_xbot; bloc.b_segment.r_xbot = bp->b_segment.r_xbot; bloc.b_segment.r_xtop = aloc.r_xtop; if (extWalkTop(&aloc, mask, func, &bloc, esws) != 0) return 1; } /* Recurse on tile right side */ if (lookRight) { aloc = *area; aloc.r_xbot = RIGHT(tp); bloc.b_segment.r_xtop = bp->b_segment.r_xtop; bloc.b_segment.r_xbot = aloc.r_xbot; if (extWalkTop(&aloc, mask, func, &bloc, esws) != 0) return 1; } /* Once a coupling tile is found, it blocks any */ /* coupling to tiles behind it, so return. */ return 0; } /* Continue to walk left until out of bounds */ tp = BL(tp); } /* Continue to walk up from right edge */ tile = RT(tile); } /* Any length which does not couple to anything in the */ /* same plane is still checked for coupling to anything */ /* below it. */ return extFindOverlap(bp->b_outside, area, esws); } /* * ---------------------------------------------------------------------------- * * extWalkBottom --- * * Search in the area 'area' below the boundary 'bp' for coupling tiles of * types in 'mask', starting from the left corner below the boundary and * sweeping right. If a coupling tile is found, process it, clipping the * boundary to the width of the tile if needed. Then recursively call * extWalkBottom on the areas to the left and right sides of the tile with * boundaries reduced to the width of those areas. This way the edge * boundary is subdivided into lengths occupied by the nearest neighbor. * * Return value: * Return 1 if func() returned 1, otherwise return 0. * * Side effects: * None. * * ---------------------------------------------------------------------------- */ int extWalkBottom(area, mask, func, bp, esws) Rect *area; TileTypeBitMask *mask; int (*func)(); Boundary *bp; extSidewallStruct *esws; { Tile *tile, *tp; TileType ttype; Boundary bloc; Rect aloc; tile = LB(bp->b_outside); /* Tile below tile on bottom of the boundary */ while (TOP(tile) > area->r_ybot) { while (RIGHT(tile) <= area->r_xbot) tile = TR(tile); /* Walk back to area */ tp = tile; while (LEFT(tp) < area->r_xtop) { if (IsSplit(tp)) ttype = (SplitSide(tp)) ? SplitRightType(tp) : SplitLeftType(tp); else ttype = TiGetTypeExact(tp); if (TTMaskHasType(mask, ttype)) { bool lookLeft, lookRight; bloc = *bp; /* Copy boundary to bc, then adjust boundary */ lookLeft = (LEFT(tp) > bp->b_segment.r_xbot) ? TRUE : FALSE; lookRight = (RIGHT(tp) < bp->b_segment.r_xtop) ? TRUE : FALSE; if (lookLeft) bloc.b_segment.r_xbot = LEFT(tp); if (lookRight) bloc.b_segment.r_xtop = RIGHT(tp); /* Call sidewall coupling calculation function */ if (func(tp, &bloc, esws) != 0) return 1; /* Clip coupling area and call fringe coupling calculation function */ aloc = *area; aloc.r_ybot = TOP(tp); aloc.r_xbot = bloc.b_segment.r_xbot; aloc.r_xtop = bloc.b_segment.r_xtop; if (extFindOverlap(bp->b_outside, &aloc, esws) != 0) return 1; extRemoveSubcap(&bloc, &aloc, esws); /* Recurse on tile left side */ if (lookLeft) { aloc = *area; aloc.r_xtop = bloc.b_segment.r_xbot; bloc.b_segment.r_xbot = bp->b_segment.r_xbot; bloc.b_segment.r_xtop = aloc.r_xtop; if (extWalkBottom(&aloc, mask, func, &bloc, esws) != 0) return 1; } /* Recurse on tile right side */ if (lookRight) { aloc = *area; aloc.r_xbot = RIGHT(tp); bloc.b_segment.r_xtop = bp->b_segment.r_xtop; bloc.b_segment.r_xbot = aloc.r_xbot; if (extWalkBottom(&aloc, mask, func, &bloc, esws) != 0) return 1; } /* Once a coupling tile is found, it blocks any */ /* coupling to tiles behind it, so return. */ return 0; } /* Continue to walk right until out of bounds */ tp = TR(tp); } /* Continue to walk down from left edge */ tile = LB(tile); } /* Any length which does not couple to anything in the */ /* same plane is still checked for coupling to anything */ /* below it. */ return extFindOverlap(bp->b_outside, area, esws); } /* * ---------------------------------------------------------------------------- * * extWalkRight --- * * Search in the area 'area' to the right of the boundary 'bp' for coupling * tiles of types in 'mask', starting from the top corner to the right of the * boundary and sweeping downward. If a coupling tile is found, process it, * clipping the boundary to the height of the tile if needed. Then recursively * call extWalkRight on the areas above and below the tile with boundaries * reduced to the height of those areas. This way the edge boundary is * subdivided into lengths occupied by the nearest neighbor. * * Return value: * Return 1 if func() returned 1, otherwise return 0. * * Side effects: * None. * * ---------------------------------------------------------------------------- */ int extWalkRight(area, mask, func, bp, esws) Rect *area; TileTypeBitMask *mask; int (*func)(); Boundary *bp; extSidewallStruct *esws; { Tile *tile, *tp; TileType ttype; Boundary bloc; Rect aloc; tile = TR(bp->b_outside); /* Tile to the right of tile to right of the boundary */ while (LEFT(tile) < area->r_xtop) { while (BOTTOM(tile) >= area->r_ytop) tile = LB(tile); /* Walk back to area */ tp = tile; while (TOP(tp) > area->r_ybot) { if (IsSplit(tp)) ttype = (SplitSide(tp)) ? SplitRightType(tp) : SplitLeftType(tp); else ttype = TiGetTypeExact(tp); if (TTMaskHasType(mask, ttype)) { bool lookDown, lookUp; bloc = *bp; /* Copy boundary to bc, then adjust boundary */ lookDown = (BOTTOM(tp) > bp->b_segment.r_ybot) ? TRUE : FALSE; lookUp = (TOP(tp) < bp->b_segment.r_ytop) ? TRUE : FALSE; if (lookDown) bloc.b_segment.r_ybot = BOTTOM(tp); if (lookUp) bloc.b_segment.r_ytop = TOP(tp); /* Call sidewall coupling calculation function */ if (func(tp, &bloc, esws) != 0) return 1; /* Clip coupling area and call fringe coupling calculation function */ aloc = *area; aloc.r_xtop = LEFT(tp); aloc.r_ybot = bloc.b_segment.r_ybot; aloc.r_ytop = bloc.b_segment.r_ytop; if (extFindOverlap(bp->b_outside, &aloc, esws) != 0) return 1; extRemoveSubcap(&bloc, &aloc, esws); /* Recurse on tile bottom side */ if (lookDown) { aloc = *area; aloc.r_ytop = bloc.b_segment.r_ybot; bloc.b_segment.r_ybot = bp->b_segment.r_ybot; bloc.b_segment.r_ytop = aloc.r_ytop; if (extWalkRight(&aloc, mask, func, &bloc, esws) != 0) return 1; } /* Recurse on tile top side */ if (lookUp) { aloc = *area; aloc.r_ybot = TOP(tp); bloc.b_segment.r_ytop = bp->b_segment.r_ytop; bloc.b_segment.r_ybot = aloc.r_ybot; if (extWalkRight(&aloc, mask, func, &bloc, esws) != 0) return 1; } /* Once a coupling tile is found, it blocks any */ /* coupling to tiles behind it, so return. */ return 0; } /* Continue to walk down until out of bounds */ tp = LB(tp); } /* Continue to walk right from top edge */ tile = TR(tile); } /* Any length which does not couple to anything in the */ /* same plane is still checked for coupling to anything */ /* below it. */ return extFindOverlap(bp->b_outside, area, esws); } /* * ---------------------------------------------------------------------------- * * extWalkLeft --- * * Search in the area 'area' to the left of the boundary 'bp' for coupling * tiles of types in 'mask', starting from the bottom corner to the left of the * boundary and sweeping upward. If a coupling tile is found, process it, * clipping the boundary to the height of the tile if needed. Then recursively * call extWalkLeft on the areas above and below the tile with boundaries * reduced to the height of those areas. This way the edge boundary is * subdivided into lengths occupied by the nearest neighbor. * * Return value: * Return 1 if func() returned 1, otherwise return 0. * * Side effects: * None. * * ---------------------------------------------------------------------------- */ int extWalkLeft(area, mask, func, bp, esws) Rect *area; TileTypeBitMask *mask; int (*func)(); Boundary *bp; extSidewallStruct *esws; { Tile *tile, *tp; TileType ttype; Boundary bloc; Rect aloc; tile = BL(bp->b_outside); /* Tile to the left of tile to left of the boundary */ while (RIGHT(tile) > area->r_xbot) { while (TOP(tile) <= area->r_ybot) tile = RT(tile); /* Walk back to area */ tp = tile; while (BOTTOM(tp) < area->r_ytop) { if (IsSplit(tp)) ttype = (SplitSide(tp)) ? SplitRightType(tp) : SplitLeftType(tp); else ttype = TiGetTypeExact(tp); if (TTMaskHasType(mask, ttype)) { bool lookDown, lookUp; bloc = *bp; /* Copy boundary to bc, then adjust boundary */ lookDown = (BOTTOM(tp) > bp->b_segment.r_ybot) ? TRUE : FALSE; lookUp = (TOP(tp) < bp->b_segment.r_ytop) ? TRUE : FALSE; if (lookDown) bloc.b_segment.r_ybot = BOTTOM(tp); if (lookUp) bloc.b_segment.r_ytop = TOP(tp); /* Call sidewall coupling calculation function */ if (func(tp, &bloc, esws) != 0) return 1; /* Clip coupling area and call fringe coupling calculation function */ aloc = *area; aloc.r_xbot = RIGHT(tp); aloc.r_ybot = bloc.b_segment.r_ybot; aloc.r_ytop = bloc.b_segment.r_ytop; if (extFindOverlap(bp->b_outside, &aloc, esws) != 0) return 1; extRemoveSubcap(&bloc, &aloc, esws); /* Recurse on tile bottom side */ if (lookDown) { aloc = *area; aloc.r_ytop = bloc.b_segment.r_ybot; bloc.b_segment.r_ybot = bp->b_segment.r_ybot; bloc.b_segment.r_ytop = aloc.r_ytop; if (extWalkLeft(&aloc, mask, func, &bloc, esws) != 0) return 1; } /* Recurse on tile top side */ if (lookUp) { aloc = *area; aloc.r_ybot = TOP(tp); bloc.b_segment.r_ytop = bp->b_segment.r_ytop; bloc.b_segment.r_ybot = aloc.r_ybot; if (extWalkLeft(&aloc, mask, func, &bloc, esws) != 0) return 1; } /* Once a coupling tile is found, it blocks any */ /* coupling to tiles behind it, so return. */ return 0; } /* Continue to walk up until out of bounds */ tp = RT(tp); } /* Continue to walk left from top edge */ tile = BL(tile); } /* Any length which does not couple to anything in the */ /* same plane is still checked for coupling to anything */ /* below it. */ return extFindOverlap(bp->b_outside, area, esws); } /* * ---------------------------------------------------------------------------- * * extSideLeft -- * * Searching to the left of the boundary 'bp', we found the tile * 'tpfar' which may lie on the far side of an edge to which the * edge bp->b_inside | bp->b_outside has sidewall coupling capacitance. * * Walk along the right-hand side of 'tpfar' searching for such * edges, and recording their capacitance in the hash table * *extCoupleHashPtr. * * Results: * Returns 0 always. * * Side effects: * If node(tpfar) exists, and node(bp->b_inside) != node(tpfar), * search along the inside edge of tpfar (the one closest to * the boundary bp) for edges having capacitance with bp. For * each such edge found, update the entry in *extCoupleHashPtr * identified by node(bp->b_inside) and node(tpfar) by adding * the capacitance due to the adjacency of the pair of edges. * * ---------------------------------------------------------------------------- */ int extSideLeft(tpfar, bp, esws) Tile *tpfar; Boundary *bp; extSidewallStruct *esws; { NodeRegion *rinside = (NodeRegion *) extGetRegion(bp->b_inside); NodeRegion *rfar = (NodeRegion *) extGetRegion(tpfar); Tile *tpnear; if (rfar != (NodeRegion *) extUnInit && rfar != rinside) { int sep = bp->b_segment.r_xbot - RIGHT(tpfar); int limit = MAX(bp->b_segment.r_ybot, BOTTOM(tpfar)); int start = MIN(bp->b_segment.r_ytop, TOP(tpfar)); for (tpnear = TR(tpfar); TOP(tpnear) > limit; tpnear = LB(tpnear)) { int overlap = MIN(TOP(tpnear), start) - MAX(BOTTOM(tpnear), limit); if (overlap > 0) extSideCommon(rinside, rfar, tpnear, tpfar, overlap, sep, esws->extCoupleList); } } return (0); } /* * ---------------------------------------------------------------------------- * * extSideRight -- * * Searching to the right of the boundary 'bp', we found the tile * 'tpfar' which may lie on the far side of an edge to which the * edge bp->b_inside | bp->b_outside has sidewall coupling capacitance. * * Walk along the left-hand side of 'tpfar' searching for such * edges, and recording their capacitance in the hash table * *extCoupleHashPtr. * * Results: * Returns 0 always. * * Side effects: * See extSideLeft. * * ---------------------------------------------------------------------------- */ int extSideRight(tpfar, bp, esws) Tile *tpfar; Boundary *bp; extSidewallStruct *esws; { NodeRegion *rinside = (NodeRegion *) extGetRegion(bp->b_inside); NodeRegion *rfar = (NodeRegion *) extGetRegion(tpfar); Tile *tpnear; if (rfar != (NodeRegion *) extUnInit && rfar != rinside) { int sep = LEFT(tpfar) - bp->b_segment.r_xtop; int limit = MIN(bp->b_segment.r_ytop, TOP(tpfar)); int start = MAX(bp->b_segment.r_ybot, BOTTOM(tpfar)); for (tpnear = BL(tpfar); BOTTOM(tpnear) < limit; tpnear = RT(tpnear)) { int overlap = MIN(TOP(tpnear), limit) - MAX(BOTTOM(tpnear), start); if (overlap > 0) extSideCommon(rinside, rfar, tpnear, tpfar, overlap, sep, esws->extCoupleList); } } return (0); } /* * ---------------------------------------------------------------------------- * * extSideTop -- * * Searching to the top of the boundary 'bp', we found the tile * 'tpfar' which may lie on the far side of an edge to which the * edge bp->b_inside | bp->b_outside has sidewall coupling capacitance. * * Walk along the bottom side of 'tpfar' searching for such * edges, and recording their capacitance in the hash table * *extCoupleHashPtr. * * Results: * Returns 0 always. * * Side effects: * See extSideLeft. * * ---------------------------------------------------------------------------- */ int extSideTop(tpfar, bp, esws) Tile *tpfar; Boundary *bp; extSidewallStruct *esws; { NodeRegion *rinside = (NodeRegion *) extGetRegion(bp->b_inside); NodeRegion *rfar = (NodeRegion *) extGetRegion(tpfar); Tile *tpnear; if (rfar != (NodeRegion *) extUnInit && rfar != rinside) { int sep = BOTTOM(tpfar) - bp->b_segment.r_ytop; int limit = MIN(bp->b_segment.r_xtop, RIGHT(tpfar)); int start = MAX(bp->b_segment.r_xbot, LEFT(tpfar)); for (tpnear = LB(tpfar); LEFT(tpnear) < limit; tpnear = TR(tpnear)) { int overlap = MIN(RIGHT(tpnear), limit) - MAX(LEFT(tpnear), start); if (overlap > 0) extSideCommon(rinside, rfar, tpnear, tpfar, overlap, sep, esws->extCoupleList); } } return (0); } /* * ---------------------------------------------------------------------------- * * extSideBottom -- * * Searching to the bottom of the boundary 'bp', we found the tile * 'tpfar' which may lie on the far side of an edge to which the * edge bp->b_inside | bp->b_outside has sidewall coupling capacitance. * * Walk along the top side of 'tpfar' searching for such * edges, and recording their capacitance in the hash table * *extCoupleHashPtr. * * Results: * Returns 0 always. * * Side effects: * See extSideLeft. * * ---------------------------------------------------------------------------- */ int extSideBottom(tpfar, bp, esws) Tile *tpfar; Boundary *bp; extSidewallStruct *esws; { NodeRegion *rinside = (NodeRegion *) extGetRegion(bp->b_inside); NodeRegion *rfar = (NodeRegion *) extGetRegion(tpfar); Tile *tpnear; if (rfar != (NodeRegion *) extUnInit && rfar != rinside) { int sep = bp->b_segment.r_ybot - TOP(tpfar); int limit = MAX(bp->b_segment.r_xbot, LEFT(tpfar)); int start = MIN(bp->b_segment.r_xtop, RIGHT(tpfar)); for (tpnear = RT(tpfar); RIGHT(tpnear) > limit; tpnear = BL(tpnear)) { int overlap = MIN(RIGHT(tpnear), start) - MAX(LEFT(tpnear), limit); if (overlap > 0) extSideCommon(rinside, rfar, tpnear, tpfar, overlap, sep, esws->extCoupleList); } } return (0); } /* * ---------------------------------------------------------------------------- * * extSideCommon -- * * Perform the actual update to the hash table entry for * the regions 'rinside' and 'rfar'. We assume that neither * 'rinside' nor 'rfar' are extUnInit, and further that they * are not equal. * * Walk along the rules in extCoupleList, applying the appropriate * amount of capacitance for an edge with tpnear on the close side * and tpfar on the remote side. * * Results: * Returns 0 always. * * Side effects: * See extSideLeft. * * ---------------------------------------------------------------------------- */ void extSideCommon(rinside, rfar, tpnear, tpfar, overlap, sep, extCoupleList) NodeRegion *rinside, *rfar; /* Both must be valid */ Tile *tpnear, *tpfar; /* Tiles on near and far side of edge */ int overlap, sep; /* Overlap of this edge with original one, * and distance between the two. */ EdgeCap *extCoupleList; /* List of sidewall capacitance rules */ { TileType near = TiGetType(tpnear), far = TiGetType(tpfar); HashEntry *he; EdgeCap *e; CoupleKey ck; CapValue cap; if (rinside < rfar) ck.ck_1 = rinside, ck.ck_2 = rfar; else ck.ck_1 = rfar, ck.ck_2 = rinside; he = HashFind(extCoupleHashPtr, (char *) &ck); cap = extGetCapValue(he); for (e = extCoupleList; e; e = e->ec_next) if (TTMaskHasType(&e->ec_near, near) && TTMaskHasType(&e->ec_far, far)) { cap += (e->ec_cap * overlap) / (sep + e->ec_offset); if (CAP_DEBUG) extAdjustCouple(he, (e->ec_cap * overlap) / (sep + e->ec_offset), "sidewall"); } extSetCapValue(he, cap); }