/* -*- tab-width: 4 -*-
*
* Electric(tm) VLSI Design System
*
* File: Pms2.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.tool.generator.layout.FoldedMos;
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;
public class Pms2 {
private static final double gY = 4.0;
private static final double dY = 11.0;
private static final double pmosBot = 9.0;
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 = "pms2";
sz = stdCell.checkMinStrength(sz, .25, nm);
int nbStacked = 2;
// p1_p1_sp/2 + p1m1_wid + p1_diff_sp
double spaceAvail = stdCell.getCellTop() - 1.5 - 5 - 2 - pmosBot;
double totWid = sz * 6 * nbStacked;
FoldsAndWidth fw = stdCell.calcFoldsAndWidth(spaceAvail, totWid, 1);
error(fw==null, "can't make Pms2 this small: "+sz);
// g2 must be spaced from vdd rail and pmos
// upperVddEdge +m1_m1_sp + m1_wid/2
double g2FromVddY =
stdCell.getVddY() + stdCell.getVddWidth()/2 + 3 + 2;
// upperMosEdge + p1_diff_sp + p1m1_wid/2
double g2FromMosY = pmosBot + fw.physWid + 2 + 2.5;
double g2Y = Math.max(g2FromVddY, g2FromMosY);
Cell pms2 = stdCell.findPart(nm, sz);
if (pms2!=null) return pms2;
pms2 = stdCell.newPart(nm, sz);
// leave vertical m1 track for g
double gX = 1.5 + 2; // m1_m1_sp/2 + m1_wid/2
LayoutLib.newExport(pms2, "g", PortCharacteristic.IN, tech.m1(),
4, gX, gY);
double mosX = gX + 2 + 3 + 2; // m1_wid/2 + m1_m1_sp + m1_wid/2
double pmosY = pmosBot + fw.physWid/2;
FoldedMos pmos = new FoldedPmos(mosX, pmosY, fw.nbFolds, nbStacked,
fw.gateWid, pms2, tech);
// g2 m1_wid/2 + m1_m1_sp + m1_wid/2
double g2X = StdCellParams.getRightDiffX(pmos) + 2 + 3 + 2;
LayoutLib.newExport(pms2, "g2", PortCharacteristic.IN, tech.m1(),
4, g2X, g2Y);
// output m1_wid/2 + m1_m1_sp + m1_wid/2
double dX = g2X + 2 + 3 + 2;
LayoutLib.newExport(pms2, "d", PortCharacteristic.OUT, tech.m1(),
4, dX, dY);
// create gnd export and connect to MOS source/drains
stdCell.wireVddGnd(pmos, StdCellParams.EVEN, pms2);
// connect inputs a and b
TrackRouter g = new TrackRouterH(tech.m1(), 3, gY, tech, pms2);
TrackRouter g2 = new TrackRouterH(tech.m1(), 3, g2Y, tech, pms2);
g.connect(pms2.findExport("g"));
g2.connect(pms2.findExport("g2"));
for (int i=0; i<pmos.nbGates(); i+=2) {
// connect 2 gates at a time in case nbFolds==1
if ((i/2)%2==0) {
g.connect(pmos.getGate(i, 'B'), -4, tech.getPolyLShapeOffset());
g2.connect(pmos.getGate(i+1, 'T'), 4, -tech.getPolyLShapeOffset());
} else {
g.connect(pmos.getGate(i+1, 'B'), 4, tech.getPolyLShapeOffset());
g2.connect(pmos.getGate(i, 'T'), -4, -tech.getPolyLShapeOffset());
}
}
// connect output
TrackRouter d = new TrackRouterH(tech.m2(), 4, dY, tech, pms2);
d.connect(pms2.findExport("d"));
for (int i=1; i<pmos.nbSrcDrns(); i+=2) {d.connect(pmos.getSrcDrn(i));}
// add wells
double wellMinX = 0;
double wellMaxX = dX + 2 + 1.5; // m1_wid/2 + m1m1_space/2
stdCell.addPmosWell(wellMinX, wellMaxX, pms2);
// add essential bounds
stdCell.addPstackEssentialBounds(wellMinX, wellMaxX, pms2);
// perform Network Consistency Check
stdCell.doNCC(pms2, nm+"{sch}");
return pms2;
}
}