/* -*- tab-width: 4 -*-
*
* Electric(tm) VLSI Design System
*
* File: Nand3_star_en_star.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.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_en_star {
private static final double nmosTop = -11.5;
private static final double pmosBot = 9.0;
// private static final double wellOverhangDiff = 6;
private static final double inbY = -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);
}
private static void connectIncSymmetric(TrackRouter incLo, FoldedMos nmos,
FoldedMos[] pmoss, TechType tech) {
for (int i=0; i<nmos.nbGates()/3; i++) {
int dPort = 0;
double dx = 0;
switch (i%4) {
case 0: dPort=2; dx=-tech.getPolyLShapeOffset(); break;
case 1: dPort=1; dx=-0.5; break;
case 2: dPort=1; dx=-tech.getPolyLShapeOffset(); break;
case 3: dPort=0; dx= 0.5; break;
}
incLo.connect(nmos.getGate(i*3+dPort, 'T'), dx);
}
for (int i=0; i<pmoss.length; i++) {
for (int j=0; j<pmoss[i].nbGates(); j++) {
double dx = 0;
boolean con = true;
switch (j) {
case 1: dx= 0.5; break;
case 3: dx=-tech.getPolyLShapeOffset(); break;
case 5: dx=-0.5; break;
case 7: dx=-tech.getPolyLShapeOffset(); break;
default: con = false;
}
if (con) incLo.connect(pmoss[i].getGate(j, 'B'), dx);
}
}
}
private static void connectIncAsymmetric(TrackRouter incLo, FoldedMos nmos,
FoldedMos[] pmoss, TechType tech) {
for (int i=0; i<nmos.nbGates()/3; i++) {
int dPort = 0;
double dx=0, dy=0;
switch (i%4) {
case 0: dPort=2; dx=-tech.getPolyLShapeOffset(); dy= 0.0; break;
case 1: dPort=0; dx=-tech.getPolyLShapeOffset(); dy= 0.0; break;
case 2: dPort=2; dx= tech.getPolyTShapeOffset(); dy=-tech.getPolyTShapeOffset(); break;
case 3: dPort=0; dx=-4.5; dy=-tech.getPolyTShapeOffset(); break;
}
incLo.connect(nmos.getGate(i*3+dPort, 'T'), dx, dy);
}
for (int i=0; i<pmoss.length; i++) {
for (int j=0; j<pmoss[i].nbGates(); j++) {
double dx = 0;
boolean con = true;
switch (j) {
case 1: dx= 0.5; break;
case 2: dx= 0.5; break;
case 4: dx= 0.0; break;
case 6: dx= tech.getPolyLShapeOffset(); break;
default: con = false;
}
if (con) incLo.connect(pmoss[i].getGate(j, 'B'), dx);
}
}
}
private static void connectInbSymmetric(TrackRouter inb, FoldedMos nmos,
FoldedMos[] pmoss, TechType tech) {
for (int i=0; i<nmos.nbGates()/3; i++) {
int dPort = 0;
double dx = 0;
switch (i%4) {
case 0: dPort=1; dx=-tech.getPolyLShapeOffset(); break;
case 1: dPort=0; dx=-tech.getPolyLShapeOffset(); break;
case 2: dPort=2; dx= tech.getPolyLShapeOffset(); break;
case 3: dPort=1; dx= tech.getPolyLShapeOffset(); break;
}
inb.connect(nmos.getGate(i*3+dPort, 'T'), dx);
}
for (int i=0; i<pmoss.length; i++) {
for (int j=0; j<pmoss[i].nbGates(); j++) {
double dx = 0;
boolean con = true;
switch (j) {
case 0: dx= tech.getPolyTShapeOffset(); break;
case 2: dx= 0.5; break;
case 4: dx= 0.0; break;
case 6: dx=-0.5; break;
default: con = false;
}
if (con) inb.connect(pmoss[i].getGate(j, 'B'), dx, tech.getPolyLShapeOffset());
}
}
}
private static void connectInbAsymmetric(TrackRouter inb, FoldedMos nmos,
FoldedMos[] pmoss, TechType tech) {
for (int i=0; i<nmos.nbGates()/3; i++) {
int dPort = 0;
double dx = 0;
switch (i%4) {
case 0: dPort=1; dx=-tech.getPolyLShapeOffset(); break;
case 1: dPort=1; dx= tech.getPolyLShapeOffset(); break;
case 2: dPort=1; dx=-tech.getPolyLShapeOffset(); break;
case 3: dPort=1; dx= tech.getPolyLShapeOffset(); break;
}
inb.connect(nmos.getGate(i*3+dPort, 'T'), dx);
}
for (int i=0; i<pmoss.length; i++) {
for (int j=0; j<pmoss[i].nbGates(); j++) {
double dx=0, dy=0;
boolean con = true;
switch (j) {
case 0: dx= tech.getPolyTShapeOffset(); dy= 0.0; break;
case 3: dx= 0.5; dy= 0.0; break;
case 5: dx=-0.5; dy= 0.0; break;
case 7: dx= 4.5; dy= 9.5; break;
default: con = false;
}
if (con) inb.connect(pmoss[i].getGate(j, 'B'), dx, dy);
}
}
}
static Cell makePart(double sz, String threshold, String symmetry,
StdCellParams stdCell) {
TechType tech = stdCell.getTechType();
sz = stdCell.roundSize(sz);
error(!threshold.equals("") && !threshold.equals("LT"),
"Nand3en: threshold not \"\" or \"LT\": "+threshold);
error(!symmetry.equals("") && !symmetry.equals("SY"),
"Nand3en: symmetry not \"\" or \"SY\": "+symmetry);
String nm = "nand3" + threshold + "en" +
(symmetry.equals("SY") ? "_sy" : "");
double nmosMinSz = 1./3 * (symmetry.equals("SY") ? 2 : 1);
double pmosMinSz = threshold.equals("LT") ? 3./3 : 3./6;
sz = stdCell.checkMinStrength(sz, Math.max(nmosMinSz, pmosMinSz), nm);
// COMPUTE NUMBER of folds and width for PMOS
double spaceAvail = // wellOverhangDiff
stdCell.getCellTop() - 6 - pmosBot;
double lamPerSz = threshold.equals("LT") ? 3 : 6;
double totWid = sz * lamPerSz * 2; // 2 independent pullups
FoldsAndWidth fwP = stdCell.calcFoldsAndWidth(spaceAvail, totWid, 2);
error(fwP==null, "can't make "+nm+" this small: "+sz);
// Compute number of folds and width for NMOS
int nbStackedN = 3;
// nd_p1_sp + p1m1_wid + p1_p1_sp/2
spaceAvail = nmosTop - (stdCell.getCellBot() + 2 + 5 + 1.5);
totWid = sz * 3 * nbStackedN;
int grpSz = symmetry.equals("SY") ? 2 : 1;
FoldsAndWidth fwN = stdCell.calcFoldsAndWidth(spaceAvail, totWid,grpSz);
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, inc, and inb jog
double incX = 1.5 + 2; // m1_m1_sp/2 + m1_wid/2
double inbX = incX + 2 + 3 + 2; // m1_wid/2 + m1_m1_sp + m1_wid/2
double jogcX = inbX + 2 + 3 + 2; // m1_wid/2 + m1_m1_sp + m1_wid/2
double mosX = jogcX + 2 + 3 + 2;// m1_wid/2 + m1_m1_sp + diffCont_wid/2
// NMOS
FoldedMos nmos =
new FoldedNmos(mosX, nmosTop - fwN.physWid/2, fwN.nbFolds,
nbStackedN, fwN.gateWid, nand, tech);
// PMOS
// pmos pitch for 8 folds: 8 * 8 = 64
// nmos pitch for 4 folds: 4 * 18 = 72
// Create one FoldedMos for every 8 folds.
// Align left diffusions of first NMOS and PMOS
double pmosY = pmosBot + fwP.physWid/2;
FoldedMos[] pmoss = new FoldedMos[(int) Math.ceil(fwP.nbFolds/8.0)];
for (int i=0; i<pmoss.length; i++) {
double pmosPitch = 72;
int nbFolds = Math.min(8, fwP.nbFolds - i*8);
pmoss[i] = new FoldedPmos(mosX + i*pmosPitch, pmosY, nbFolds, 1,
fwP.gateWid, nand, tech);
}
// Fill select notch between foldedmos
stdCell.fillDiffAndSelectNotches(pmoss, false);
// Drop down a single PMOS pullup for ina
double rightPdiffX = StdCellParams.getRightDiffX(pmoss);
double rightNdiffX = StdCellParams.getRightDiffX(nmos);
// pdm1_wid/2 + selOverhangDiff + sel_sel_sp + selOverhangDiff + pdm1_wid/2
double pmosaFromPmos = rightPdiffX + 2.5 + 2 + 2 + 2 + 2.5;
double pmosaFromNmos = rightNdiffX - 8;
double pmosaX = Math.max(pmosaFromPmos, pmosaFromNmos);
FoldedMos pmosa = new FoldedPmos(pmosaX, stdCell.getVddY(), 1, 1, 5,
nand, tech);
// Fill select notch betweeb pmosa and last pmos
stdCell.fillDiffAndSelectNotches(new FoldedMos[]{pmoss[pmoss.length-1], pmosa}, false);
// create vdd and gnd exports and connect to MOS source/drains
stdCell.wireVddGnd(nmos, StdCellParams.EVEN, nand);
stdCell.wireVddGnd(pmoss, StdCellParams.EVEN, nand);
stdCell.wireVddGnd(new FoldedMos[] {pmoss[0], pmosa},
StdCellParams.EVEN, nand);
// Nand input C
double incHiY = 11;
LayoutLib.newExport(nand, "inc", PortCharacteristic.IN, tech.m1(),
4, incX, incHiY);
TrackRouter incHi = new TrackRouterH(tech.m2(), 3, incHiY, tech, nand);
incHi.connect(nand.findExport("inc"));
PortInst jogc = LayoutLib.newNodeInst(tech.m1pin(), jogcX, incHiY, 3, 3,
0, nand).getOnlyPortInst();
incHi.connect(jogc);
TrackRouter incLo = new TrackRouterH(tech.m1(), 3, incY, tech, nand);
incLo.connect(jogc);
if (symmetry.equals("SY")) {
connectIncSymmetric(incLo, nmos, pmoss, tech);
} else {
connectIncAsymmetric(incLo, nmos, pmoss, tech);
}
// Nand input B
TrackRouter inb = new TrackRouterH(tech.m1(), 3, inbY, tech, nand);
LayoutLib.newExport(nand, "inb", PortCharacteristic.IN, tech.m1(),
4, inbX, inbY);
inb.connect(nand.findExport("inb"));
if (symmetry.equals("SY")) {
connectInbSymmetric(inb, nmos, pmoss, tech);
} else {
connectInbAsymmetric(inb, nmos, pmoss, tech);
}
// Nand input A
// above Vdd power rail
// m1_wid/2 + m1_m1_sp + m1_wid/2
double inaX = LayoutLib.roundCenterX(pmosa.getSrcDrn(1)) + 2 + 3 + 2;
double inaHiY = stdCell.getVddY() + stdCell.getVddWidth()/2 +
3 + 2; // m1_m1_sp + m1_wid/2
LayoutLib.newExport(nand, "ina", PortCharacteristic.IN, tech.m1(),
4, inaX, inaHiY);
TrackRouter inaHi = new TrackRouterH(tech.m1(), 3, inaHiY, tech, nand);
inaHi.connect(nand.findExport("ina"));
inaHi.connect(pmosa.getGate(0, 'T'), tech.getPolyLShapeOffset());
// bottom of cell
double gndBot = stdCell.getGndY() - stdCell.getGndWidth()/2;
double inaFromGnd = gndBot - 3 - 2; // -m1_m1_sp -m1_wid/2
double nmosBot = nmosTop - fwN.physWid;
double inaFromMos = nmosBot - 2 -2.5; // -nd_p1_sp - p1m1_wid/2
double inaLoY = Math.min(inaFromGnd, inaFromMos);
TrackRouter inaLo = new TrackRouterH(tech.m1(), 3, inaLoY, tech, nand);
for (int i=0; i<fwN.nbFolds; i++) {
int dPort=0;
double dx=0;
switch (i%2) {
case 0: dPort=0; dx=-4.0; break;
case 1: dPort=2; dx= 4.0; break;
}
inaLo.connect(nmos.getGate(i*3+dPort, 'B'), dx, tech.getPolyLShapeOffset());
}
inaLo.connect(nand.findExport("ina"));
// Nand output
double outX = inaX + 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));
}
}
outHi.connect(pmosa.getSrcDrn(1));
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));
}
// 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;
}
}