/* -*- tab-width: 4 -*-
*
* Electric(tm) VLSI Design System
*
* File: Nms3_sy3.java
*
* Copyright (c) 2003 Sun Microsystems and Static Free Software
*
* Electric(tm) is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*
* Electric(tm) is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with Electric(tm); see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
* Boston, Mass 02111-1307, USA.
*/
package com.sun.electric.tool.generator.layout.gates;
import com.sun.electric.database.hierarchy.Cell;
import com.sun.electric.database.prototype.PortCharacteristic;
import com.sun.electric.database.topology.PortInst;
import com.sun.electric.tool.generator.layout.FoldedMos;
import com.sun.electric.tool.generator.layout.FoldedNmos;
import com.sun.electric.tool.generator.layout.FoldsAndWidth;
import com.sun.electric.tool.generator.layout.LayoutLib;
import com.sun.electric.tool.generator.layout.StdCellParams;
import com.sun.electric.tool.generator.layout.TechType;
import com.sun.electric.tool.generator.layout.TrackRouter;
import com.sun.electric.tool.generator.layout.TrackRouterH;
import com.sun.electric.tool.Job;
public class Nms3_sy3 {
private static final double nmosTop = -9.0;
// private static final double wellOverhangDiff = 6;
private static final double incY = -4.0;
// private static final double inaY = 4.0;
private static final double outY = -11.0;
private static void error(boolean pred, String msg) {
Job.error(pred, msg);
}
public static Cell makePart(double sz, StdCellParams stdCell) {
TechType tech = stdCell.getTechType();
sz = stdCell.roundSize(sz);
String nm = "nms3_sy3";
sz = stdCell.checkMinStrength(sz, 1, nm);
// Compute number of folds and width for NMOS
int nbStackedN = 3;
double spaceAvail = nmosTop - (stdCell.getCellBot() +
// p1OverhangDiff + p1_p1_sp + p1m1_wid + p1_p1_sp + p1m1_wid + p1_p1_sp/2
2 + 3 + 5 + 3 + 5 + 1.5);
double totWid = sz * 3 * nbStackedN;
FoldsAndWidth fwN = stdCell.calcFoldsAndWidth(spaceAvail, totWid, 3);
error(fwN == null, "can't make " + nm + " this small: " + sz);
// create NAND Part
Cell nand = stdCell.findPart(nm, sz);
if (nand != null)
return nand;
nand = stdCell.newPart(nm, sz);
// leave vertical m1 tracks for inB, inC, and inc jog
double inaX = 1.5 + 2; // m1_m1_sp/2 + m1_wid/2
double inbX = inaX + 2 + 3 + 2; // m1_wid/2 + m1_m1_sp + m1_wid/2
double jogaX = inbX + 2 + 3 + 2; // m1_wid/2 + m1_m1_sp + m1_wid/2
double nmosX = jogaX + 2 + 3 + 2;
// m1_wid/2 + m1_m1_sp + diffCont_wid/2
// NMOS
FoldedMos nmos =
new FoldedNmos(nmosX, nmosTop - fwN.physWid / 2, fwN.nbFolds,
nbStackedN, fwN.gateWid, nand, tech);
// create vdd and gnd exports and connect to MOS source/drains
stdCell.wireVddGnd(nmos, StdCellParams.EVEN, nand);
// Nand input A
double inaHiY = -11;
LayoutLib.newExport(nand, "ina", PortCharacteristic.IN, tech.m1(),
4, inaX, inaHiY);
TrackRouter inaHi = new TrackRouterH(tech.m2(), 3, inaHiY, tech, nand);
inaHi.connect(nand.findExport("ina"));
PortInst joga =
LayoutLib.newNodeInst(tech.m1pin(), jogaX, inaHiY, 3, 3, 0, nand
).getOnlyPortInst();
inaHi.connect(joga);
double gndBot = stdCell.getGndY() - stdCell.getGndWidth() / 2;
double spFromGnd = gndBot - 3 - 2; // -m1_m1_sp -m1_wid/2
// -polyOverhangDiff - p1_p1_sp -p1m1/2
double nmosBot = nmosTop - fwN.physWid;
double inaLoY = Math.min(spFromGnd, nmosBot - 2 - 3 - 2.5);
TrackRouter inaLo = new TrackRouterH(tech.m1(), 3, inaLoY, tech, nand);
inaLo.connect(joga);
for (int i = 0; i < fwN.nbFolds; i++) {
switch (i % 6) {
case 0 :
inaLo.connect(nmos.getGate(i * 3 + 0, 'B'), -4, tech.getPolyLShapeOffset());
break;
case 1 :
inaLo.connect(nmos.getGate(i * 3 + 1, 'B'), tech.getPolyLShapeOffset());
break;
case 2 :
inaLo.connect(nmos.getGate(i * 3 + 2, 'B'));
break;
case 3 :
inaLo.connect(nmos.getGate(i * 3 + 0, 'B'));
break;
case 4 :
inaLo.connect(nmos.getGate(i * 3 + 1, 'B'), -tech.getPolyLShapeOffset());
break;
case 5 :
inaLo.connect(nmos.getGate(i * 3 + 2, 'B'), 4, tech.getPolyLShapeOffset());
break;
}
}
// Nand input B
double inbY = inaLoY - 8; // poly contact pitch
LayoutLib.newExport(nand, "inb", PortCharacteristic.IN, tech.m1(),
4, inbX, inbY);
TrackRouter inbLo = new TrackRouterH(tech.m1(), 3, inbY, tech, nand);
inbLo.connect(nand.findExport("inb"));
for (int i = 0; i < fwN.nbFolds; i++) {
switch (i % 6) {
case 0 :
inbLo.connect(nmos.getGate(i * 3 + 1, 'B'));
break;
case 1 :
inbLo.connect(nmos.getGate(i * 3 + 0, 'B'));
break;
case 2 :
inbLo.connect(nmos.getGate(i * 3 + 0, 'B'));
break;
case 3 :
inbLo.connect(nmos.getGate(i * 3 + 2, 'B'));
break;
case 4 :
inbLo.connect(nmos.getGate(i * 3 + 2, 'B'));
break;
case 5 :
inbLo.connect(nmos.getGate(i * 3 + 1, 'B'));
break;
}
}
// Nand input C
TrackRouter inc = new TrackRouterH(tech.m1(), 3, incY, tech, nand);
for (int i = 0; i < fwN.nbFolds; i++) {
switch (i % 6) {
case 0: inc.connect(nmos.getGate(i*3+2, 'T'), 1.5); break;
case 1: inc.connect(nmos.getGate(i*3+2, 'T'), 1.5); break;
case 2: inc.connect(nmos.getGate(i*3+1, 'T'), -11.5, 1); break;
case 3: inc.connect(nmos.getGate(i*3+1, 'T'), 11.5, 1); break;
case 4: inc.connect(nmos.getGate(i*3+0, 'T'), -1.5); break;
case 5: inc.connect(nmos.getGate(i*3+0, 'T'), -1.5); break;
}
}
// m1_wid + m1_space + m1_wid/2
double incX = StdCellParams.getRightDiffX(nmos) + 2 + 3 + 2;
LayoutLib.newExport(nand, "inc", PortCharacteristic.IN, tech.m1(),
4, incX, incY);
inc.connect(nand.findExport("inc"));
// Nand output
double outX = incX + 2 + 3 + 2; // m1_wid/2 + m1_sp + m1_wid/2
LayoutLib.newExport(nand, "out", PortCharacteristic.OUT, tech.m1(),
4, outX, outY);
TrackRouter outLo = new TrackRouterH(tech.m2(), 4, outY, tech, nand);
outLo.connect(nand.findExport("out"));
for (int i = 1; i < nmos.nbSrcDrns(); i += 2) {
outLo.connect(nmos.getSrcDrn(i));
}
// add wells
double wellMinX = 0;
double wellMaxX = outX + 2 + 1.5; // m1_wid/2 + m1m1_space/2
stdCell.addNmosWell(wellMinX, wellMaxX, nand);
// add essential bounds
stdCell.addNstackEssentialBounds(wellMinX, wellMaxX, nand);
// perform Network Consistency Check
stdCell.doNCC(nand, nm+"{sch}");
return nand;
}
}