Exemplo n.º 1
0
  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;
  }
Exemplo n.º 2
0
  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;
  }
Exemplo n.º 3
0
 private static void error(boolean pred, String msg) {
   LayoutLib.error(pred, msg);
 }