/* -*- tab-width: 4 -*-
*
* Electric(tm) VLSI Design System
*
* File: Pms1.java
*
* Copyright (c) 2003, Oracle and/or its affiliates. All rights reserved.
*
* 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 Pms1 {
private static final double wellOverhangDiff = 6;
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 = "pms1" + (stdCell.getDoubleStrapGate() ? "_strap" : "");
sz = stdCell.checkMinStrength(sz, .5, nm);
// Space needed at bottom of MOS well.
// We need more space if we're double strapping poly.
double outsideSpace = stdCell.getDoubleStrapGate() ? (
1.5 + 5 + 2 // p1_p1_sp/2 + p1m1_wid + p1_pd_sp
) : (
wellOverhangDiff
);
double spaceAvail = stdCell.getCellTop() - outsideSpace - pmosBot;
double totWid = sz * 6;
FoldsAndWidth fw = stdCell.calcFoldsAndWidth(spaceAvail, totWid, 1);
error(fw==null, "can't make Pms1 this small: "+sz);
Cell pms1 = stdCell.findPart(nm, sz);
if (pms1!=null) return pms1;
pms1 = stdCell.newPart(nm, sz);
// leave vertical m1 track for g
double gX = 1.5 + 2; // m1_m1_sp/2 + m1_wid/2
LayoutLib.newExport(pms1, "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, 1,
fw.gateWid, pms1, tech);
// output m1_wid/2 + m1_m1_sp + m1_wid/2
double dX = StdCellParams.getRightDiffX(pmos) + 2 + 3 + 2;
LayoutLib.newExport(pms1, "d", PortCharacteristic.OUT, tech.m1(),
4, dX, dY);
// create gnd export and connect to MOS source/drains
stdCell.wireVddGnd(pmos, StdCellParams.EVEN, pms1);
// connect up g
TrackRouter g = new TrackRouterH(tech.m1(), 3, gY, tech, pms1);
g.connect(pms1.findExport("g"));
for (int i=0; i<pmos.nbGates(); i++) g.connect(pmos.getGate(i, 'B'));
if (stdCell.getDoubleStrapGate()) {
// Connect gates using metal1 along top of cell
double vddTop = stdCell.getVddY() + stdCell.getVddWidth()/2;
double gHiFromVdd = vddTop + 3 + 2; // m1_m1_sp +m1_wid/2
double pmosTop = pmosY + fw.physWid/2;
double gHiFromMos = pmosTop + 2 + 2.5; // pd_p1_sp + p1m1_wid/2
double gHiY = Math.max(gHiFromVdd, gHiFromMos);
TrackRouter gHi = new TrackRouterH(tech.m1(), 3, gHiY, tech, pms1);
gHi.connect(pms1.findExport("g"));
for (int i=0; i<pmos.nbGates(); i++) {
gHi.connect(pmos.getGate(i, 'T'));
}
}
// connect up output
TrackRouter d = new TrackRouterH(tech.m2(), 4, dY, tech, pms1);
d.connect(pms1.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, pms1);
// add essential bounds
stdCell.addPstackEssentialBounds(wellMinX, wellMaxX, pms1);
// perform Network Consistency Check
stdCell.doNCC(pms1, nm+"{sch}");
return pms1;
}
}