public Cell makeVddGndM3Cell(Cell layCell, TechType tech) {
Library layLib = layCell.getLibrary();
CellName nm = layCell.getCellName();
String m3Nm = nm.getName() + "_m3{lay}";
Cell m3Cell = Cell.newInstance(layLib, m3Nm);
Rectangle2D bounds = layCell.findEssentialBounds();
double minX = bounds.getMinX();
double minY = bounds.getMinY();
double maxX = bounds.getMaxX();
double maxY = bounds.getMaxY();
LayoutLib.newNodeInst(tech.essentialBounds(), minX, minY, DEF_SIZE, DEF_SIZE, 0, m3Cell);
LayoutLib.newNodeInst(tech.essentialBounds(), maxX, maxY, DEF_SIZE, DEF_SIZE, 180, m3Cell);
for (Integer x : xCoords) {
PortInst p1 =
LayoutLib.newNodeInst(tech.m3pin(), x, minY, DEF_SIZE, DEF_SIZE, 180, m3Cell)
.getOnlyPortInst();
PortInst p2 =
LayoutLib.newNodeInst(tech.m3pin(), x, maxY, DEF_SIZE, DEF_SIZE, 180, m3Cell)
.getOnlyPortInst();
LayoutLib.newArcInst(tech.m3(), vddGndWidth, p1, p2);
}
return m3Cell;
}
public static Cell makePart(double sz, StdCellParams stdCell) {
TechType tech = stdCell.getTechType();
sz = stdCell.roundSize(sz);
String nm = "nms1" + (stdCell.getDoubleStrapGate() ? "_strap" : "");
sz = stdCell.checkMinStrength(sz, 1, nm);
// Space needed at top of MOS well.
// We need more space if we're double strapping poly.
double outsideSpace =
stdCell.getDoubleStrapGate()
? (2 + 5 + 1.5 // p1_nd_sp + p1m1_wid + p1_p1_sp/2
)
: (wellOverhangDiff);
double spaceAvail = nmosTop - (stdCell.getCellBot() + outsideSpace);
double totWid = sz * 3;
FoldsAndWidth fw = stdCell.calcFoldsAndWidth(spaceAvail, totWid, 1);
error(fw == null, "can't make Nms1 this small: " + sz);
Cell nms1 = stdCell.findPart(nm, sz);
if (nms1 != null) return nms1;
nms1 = stdCell.newPart(nm, sz);
// leave vertical m1 track for g
double gX = 1.5 + 2; // m1_m1_sp/2 + m1_wid/2
LayoutLib.newExport(nms1, "g", PortCharacteristic.IN, tech.m1(), 4, gX, gY);
// gnd port overlaps leftmost MOS diffusion contacts
double mosX = gX + 2 + 3 + 2; // m1_wid/2 + m1_m1_sp + m1_wid/2
double nmosY = nmosTop - fw.physWid / 2;
FoldedMos nmos = new FoldedNmos(mosX, nmosY, fw.nbFolds, 1, fw.gateWid, nms1, tech);
// output d m1_wid/2 + m1_m1_sp + m1_wid/2
double dX = StdCellParams.getRightDiffX(nmos) + 2 + 3 + 2;
LayoutLib.newExport(nms1, "d", PortCharacteristic.OUT, tech.m1(), 4, dX, dY);
// create gnd export and connect to MOS source/drains
stdCell.wireVddGnd(nmos, StdCellParams.EVEN, nms1);
// connect up input g
TrackRouter g = new TrackRouterH(tech.m1(), 3, gY, tech, nms1);
g.connect(nms1.findExport("g"));
for (int i = 0; i < nmos.nbGates(); i++) g.connect(nmos.getGate(i, 'T'));
if (stdCell.getDoubleStrapGate()) {
// Connect gates using metal1 along bottom of cell
double gndBot = stdCell.getGndY() - stdCell.getGndWidth() / 2;
double inLoFromGnd = gndBot - 3 - 2; // -m1_m1_sp -m1_wid/2
double nmosBot = nmosY - fw.physWid / 2;
double inLoFromMos = nmosBot - 2 - 2.5; // -nd_p1_sp -p1m1_wid/2
double inLoY = Math.min(inLoFromGnd, inLoFromMos);
TrackRouter inLo = new TrackRouterH(tech.m1(), 3, inLoY, tech, nms1);
inLo.connect(nms1.findExport("g"));
for (int i = 0; i < nmos.nbGates(); i++) {
inLo.connect(nmos.getGate(i, 'B'));
}
}
// connect up output d
TrackRouter d = new TrackRouterH(tech.m2(), 4, dY, tech, nms1);
d.connect(nms1.findExport("d"));
for (int i = 1; i < nmos.nbSrcDrns(); i += 2) {
d.connect(nmos.getSrcDrn(i));
}
// add wells
double wellMinX = 0;
double wellMaxX = dX + 2 + 1.5; // m1_wid/2 + m1m1_space/2
stdCell.addNmosWell(wellMinX, wellMaxX, nms1);
// add essential bounds
stdCell.addNstackEssentialBounds(wellMinX, wellMaxX, nms1);
// perform Network Consistency Check
stdCell.doNCC(nms1, nm + "{sch}");
return nms1;
}
private static void error(boolean pred, String msg) {
LayoutLib.error(pred, msg);
}
