/* -*- tab-width: 4 -*-
*
* Electric(tm) VLSI Design System
*
* File: Nand3_star.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.FoldedPmos;
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;
class Nand3_star {
private static final double nmosTop = -9.0;
private static final double pmosBot = 9.0;
// private static final double wellOverhangDiff = 6;
private static final double inaY = -4.0;
private static final double incY = 4.0;
private static final double outHiY = 11.0;
private static final double outLoY = -11.0;
private static void error(boolean pred, String msg) {
Job.error(pred, msg);
}
static Cell makePart(double sz, String threshold,
StdCellParams stdCell) {
TechType tech = stdCell.getTechType();
sz = stdCell.roundSize(sz);
error(!threshold.equals("") && !threshold.equals("LT") &&
!threshold.equals("MLT"),
"Nand3: threshold not \"\", \"MLT\", or \"LT\": "+threshold);
String nm = "nand3" + threshold;
double lamPerSz = threshold.equals("LT") ? (
2 // three pullups on at once
) : threshold.equals("MLT") ? (
3 // two pullups on at once
) : (
6 // one pullup on at once
);
double minSz = 3/lamPerSz;
sz = stdCell.checkMinStrength(sz, minSz, nm);
// Compute number of folds and width for PMOS
double spaceAvail = // p1_p1_sp/2 + p1m1_wid + p1pd_sp
stdCell.getCellTop() - (1.5 + 5 + 2) - pmosBot;
double totWid = sz * lamPerSz * 3; // 3 independent pullups
FoldsAndWidth fwP = stdCell.calcFoldsAndWidth(spaceAvail, totWid, 3);
error(fwP==null, "can't make "+nm+" this small: "+sz);
// Compute number of folds and width for NMOS
int nbStackedN = 3;
// p1OverhangDiff + p1_p1_sp + p1m1_wid + p1_p1_sp/2
spaceAvail = nmosTop - (stdCell.getCellBot() + 2 + 3 + 5 + 1.5);
totWid = sz * 3 * nbStackedN;
FoldsAndWidth fwN = stdCell.calcFoldsAndWidth(spaceAvail, totWid, 1);
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 ina, inb, and ina 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 jogbX = inbX + 2 + 3 + 2; // m1_wid/2 + m1_m1_sp + m1_wid/2
double nmosX = jogbX + 2 + 3 + 2;//m1_wid/2 + m1_m1_sp + diffCont_wid/2
// NMOS
double nmosY = nmosTop - fwN.physWid/2;
FoldedMos nmos = new FoldedNmos(nmosX, nmosY, fwN.nbFolds, nbStackedN,
fwN.gateWid, nand, tech);
// PMOS Create multiple PMOS ORs.
double pmosY = pmosBot + fwP.physWid/2;
FoldedMos[] pmoss = new FoldedMos[fwP.nbFolds/3];
for (int i=0; i<pmoss.length; i++) {
// magic offset makes gate contacts work
double pmosPitch = 36;
double pmosX = nmosX - 3.5 + i*pmosPitch;
pmoss[i] = new FoldedPmos(pmosX, pmosY, 3, 1, fwP.gateWid, nand, tech);
}
// create vdd and gnd exports and connect to MOS source/drains
stdCell.wireVddGnd(nmos, StdCellParams.EVEN, nand);
stdCell.wireVddGnd(pmoss, StdCellParams.EVEN, nand);
// Nand input C
TrackRouter inc = new TrackRouterH(tech.m1(), 3, incY, tech, nand);
for (int i=0; i<nmos.nbGates(); i+=3) {
if (i/3 % 2 == 0) {
inc.connect(nmos.getGate(i+2, 'T'), 4, -tech.getPolyLShapeOffset());
} else {
inc.connect(nmos.getGate(i, 'T'), -4, -tech.getPolyLShapeOffset());
}
}
for (int i=0; i<pmoss.length; i++) {
inc.connect(pmoss[i].getGate(2, 'B'), tech.getPolyLShapeOffset());
}
// m1_wid + m1_space + m1_wid/2
double nmosRight = StdCellParams.getRightDiffX(nmos);
double pmosRight = StdCellParams.getRightDiffX(pmoss);
double incX = Math.max(nmosRight, pmosRight) + 2 + 3 + 2;
LayoutLib.newExport(nand, "inc", PortCharacteristic.IN, tech.m1(),
4, incX, incY);
inc.connect(nand.findExport("inc"));
// Nand input B
double gndBot = stdCell.getGndY() - stdCell.getGndWidth()/2;
double inbLoY = gndBot - 3 - 2; // -m1_m1_sp -m1_wid/2
// -polyOverhangDiff - p1_p1_sp -p1m1/2
inbLoY = Math.min(inbLoY, nmosTop - fwN.physWid - 2 - 3 - 2.5);
double spFromVdd = // vddTop + m1_m1_sp + m1_wid/2
stdCell.getVddY() + stdCell.getVddWidth()/2 + 3 + 2;
double spFromPmos = // pmosTop + pd_p1_sp + p1m1_wid/2
pmosBot + fwP.physWid + 2 + 2.5;
double inbHiY = Math.max(spFromVdd, spFromPmos);
LayoutLib.newExport(nand, "inb", PortCharacteristic.IN, tech.m1(),
4, inbX, inbHiY);
TrackRouter inbHi = new TrackRouterH(tech.m1(), 3, inbHiY, tech, nand);
inbHi.connect(nand.findExport("inb"));
for (int i=0; i<pmoss.length; i++) {
inbHi.connect(pmoss[i].getGate(1, 'T'));
}
TrackRouter inbLo = new TrackRouterH(tech.m1(), 3, inbLoY, tech, nand);
inbLo.connect(nand.findExport("inb"));
for (int i=0; i<nmos.nbGates(); i+=3) {
inbLo.connect(nmos.getGate(i+1, 'B'));
}
// Nand input A
double inaLoY = -11;
LayoutLib.newExport(nand, "ina", PortCharacteristic.IN, tech.m1(),
4, inaX, inaLoY);
TrackRouter inaLo = new TrackRouterH(tech.m2(), 3, inaLoY, tech, nand);
inaLo.connect(nand.findExport("ina"));
PortInst jogb = LayoutLib.newNodeInst(tech.m1pin(), jogbX, inaLoY, 3, 3,
0, nand).getOnlyPortInst();
inaLo.connect(jogb);
TrackRouter ina = new TrackRouterH(tech.m1(), 3, inaY, tech, nand);
ina.connect(jogb);
for (int i=0; i<nmos.nbGates(); i+=3) {
if (i/3 % 2 == 0) {
ina.connect(nmos.getGate(i+0, 'T'), -4, -tech.getPolyLShapeOffset());
} else {
ina.connect(nmos.getGate(i+2, 'T'), 4, -tech.getPolyLShapeOffset());
}
}
for (int i=0; i<pmoss.length; i++) {
ina.connect(pmoss[i].getGate(0, 'B'));
}
// 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, outHiY);
TrackRouter outHi = new TrackRouterH(tech.m2(), 4, outHiY, tech, nand);
outHi.connect(nand.findExport("out"));
for (int i=0; i<pmoss.length; i++) {
for (int j=1; j<pmoss[i].nbSrcDrns(); j+=2) {
outHi.connect(pmoss[i].getSrcDrn(j));
}
}
TrackRouter outLo = new TrackRouterH(tech.m2(), 4, outLoY, tech, nand);
outLo.connect(nand.findExport("out"));
for (int i=1; i<nmos.nbSrcDrns(); i+=2) {
outLo.connect(nmos.getSrcDrn(i));
}
// ============================
stdCell.fillDiffAndSelectNotches(pmoss, false);
// StdCellParams.fillSelect(nand, true, false, false);
// ============================
// add wells
double wellMinX = 0;
double wellMaxX = outX + 2 + 1.5; // m1_wid/2 + m1m1_space/2
stdCell.addNmosWell(wellMinX, wellMaxX, nand);
stdCell.addPmosWell(wellMinX, wellMaxX, nand);
// add essential bounds
stdCell.addEssentialBounds(wellMinX, wellMaxX, nand);
// perform Network Consistency Check
stdCell.doNCC(nand, nm+"{sch}");
return nand;
}
}