lenodable.java

The ElectricTM VLSI Design System is an open-source Electronic Design Automation (EDA) system that c

     * @param mfactor the parent's mfactor
     * @param su the parent's step-up
     */
    private boolean instantiate(LENodable instance, VarContext context, LENetwork outputNetwork, float mfactor, float su,
                                LENetlister2.NetlisterConstants constants, boolean testCachebility) {
        instance.outputNetwork = outputNetwork;
        boolean evalOk = true;

        // default values
        instance.context = context;
        instance.leX = getLeX(context, constants, testCachebility);
        if (instance.leX == -1f) evalOk = false;
        instance.mfactor = mfactor;
        instance.su = su;
        instance.parallelGroup = 0;

        // evaluate variables in context, if any
        if (parallelGroupVar != null) {
            Object retVal = context.evalVar(parallelGroupVar);
            if (retVal == null) evalOk = false;
            else instance.parallelGroup = VarContext.objectToInt(retVal, instance.parallelGroup);
        }
        if (suVar != null) {
            Object retVal = context.evalVar(suVar);
            if (retVal == null) evalOk = false;
            else {
                float localsu = VarContext.objectToFloat(retVal, -1f);
                instance.su = (localsu == -1f) ? instance.su : localsu;
            }
        }
        if (mfactorVar != null) {
            Object retVal = context.evalVar(mfactorVar);
            if (retVal == null) evalOk = false;
            else instance.mfactor *= VarContext.objectToFloat(retVal, 1f);
        }
        return evalOk;
    }

    /**
     * Get the leX size for the given LENodable
     * Returns -1 if any evaluations failed.
     * @param context the VarContext
     * @return the leX size, or -1 if eval failed
     */
    private float getLeX(VarContext context, LENetlister2.NetlisterConstants constants, boolean testCachebility) {
        float leX = (float)0.0;

        Variable var = null;
        Object retVal = null;
        if (type == LENodable.Type.WIRE) {
            // Note that if inst is an LEWIRE, it will have no 'le' attributes.
            // we therefore assign pins to have default 'le' values of one.
            // This creates an instance which has Type LEWIRE, but has
            // boolean leGate set to false; it will not be sized
            // NEW: If we find ATTR_LEWIRECAP, that is the capacitance to use,
            // and we will not calculate the cap from L and W.
            var = no.getParameterOrVariable(LENetlister.ATTR_LEWIRECAP);
            float cap = 0;
            if (var != null) {
                retVal = context.evalVar(var);
                if (testCachebility && (retVal == null)) return -1f;
                cap = VarContext.objectToFloat(retVal, 0.0f);
            } else {
                var = no.getParameterOrVariable(LENetlister.ATTR_L);
                if (var == null) {
                    System.out.println("Error, no L attribute found on LEWIRE "+no.getName()+" in Cell "+no.getParent());
                    if (testCachebility) return -1f;
                }
                retVal = context.evalVar(var);
                if (testCachebility && (retVal == null)) return -1f;
                float len = VarContext.objectToFloat(retVal, 0.0f);

                var = no.getParameterOrVariable(Schematics.ATTR_WIDTH);
                if (var == null) {
                    System.out.println("Warning, no width attribute found on LEWIRE "+no.getName()+" in Cell "+no.getParent());
                    if (testCachebility) return -1f;
                }
                retVal = context.evalVar(var);
                if (testCachebility && (retVal == null)) return -1f;
                float width = VarContext.objectToFloat(retVal, 3.0f);
                cap = (0.95f*len + 0.05f*len*(width/3.0f));
            }
            leX = cap*constants.wireRatio;  // equivalent lambda of gate
            leX = leX/9.0f;                         // drive strength X=1 is 9 lambda of gate
        }
        else if (type == LENodable.Type.TRANSISTOR) {
            var = no.getParameterOrVariable(Schematics.ATTR_WIDTH);
            if (var == null) {
                System.out.println("Error: transistor "+no.getName()+" has no width in Cell "+no.getParent());
                //ErrorLogger.ErrorLog log = errorLogger.logError("Error: transistor "+no+" has no width in Cell "+info.getCell(), info.getCell(), 0);
                //log.addGeom(ni.getNodeInst(), true, no.getParent(), context);
                return -1f;
            }
            retVal = context.evalVar(var);
            if (retVal == null) return -1f;
            //float width = VarContext.objectToFloat(retVal, (float)3.0);
            float width = VarContext.objectToFloat(retVal, -1f);
            if (width == -1f) return -1f;

//            var = no.getVar(Schematics.ATTR_LENGTH);
//            if (var == null) {
//                System.out.println("Error: transistor "+no.getName()+" has no length in Cell "+no.getParent());
//                //ErrorLogger.ErrorLog log = errorLogger.logError("Error: transistor "+ni+" has no length in Cell "+info.getCell(), info.getCell(), 0);
//                //log.addGeom(ni.getNodeInst(), true, info.getCell(), info.getContext());
//                return -1f;
//            }
//            retVal = context.evalVar(var);
//            if (retVal == null) return -1f;
//            float length = VarContext.objectToFloat(retVal, (float)2.0);
            // not exactly correct because assumes all cap is area cap, which it isn't
            leX = (float)(width/9.0f);
        }
        else if (type == Type.CAPACITOR) {
            var = no.getVar(Schematics.SCHEM_CAPACITANCE);
            if (var == null) {
                System.out.println("Error: capacitor "+no.getName()+" has no capacitance in Cell "+no.getParent());
                //ErrorLogger.ErrorLog log = errorLogger.logError("Error: capacitor "+no+" has no capacitance in Cell "+info.getCell(), info.getCell(), 0);
                //log.addGeom(ni.getNodeInst(), true, no.getParent(), context);
                return -1f;
            }
            retVal = context.evalVar(var);
            if (testCachebility && (retVal == null)) return -1f;
            float cap = VarContext.objectToFloat(retVal, (float)0.0);
            leX = (float)(cap/constants.gateCap/1e-15/9.0f);
        }
        return leX;
    }

    // -----------------------------------------------------------------

    protected String getName() {
        if (context == null) return no.getName();
        return context.push(getNodable()).getInstPath(".");
    }

    protected void print() {
        System.out.println(getType().toString()+": "+getName());
        System.out.println("    Size    \t= "+leX);
        System.out.println("    Step-up \t= "+su);
        System.out.println("    Parallel Group\t= "+parallelGroup);
        System.out.println("    M Factor\t= "+mfactor);
    }

    protected String printOneLine(String indent) {
        StringBuffer buf = new StringBuffer(indent);
        buf.append(getType().toString());
        buf.append(": Size="+TextUtils.formatDouble(leX, 2));
        //buf.append(" M="+TextUtils.formatDouble(mfactor, 2));
        buf.append(" M="+mfactor);
        buf.append(" tPG="+parallelGroup);
        buf.append(" "+getName());
        return buf.toString();
    }

    protected void printPins() {
        for (LEPin pin : pins) {
            System.out.println("Pin "+pin.getName()+", le="+pin.getLE()+", dir="+pin.getDir()+" on network "+pin.getNetwork());
        }
    }

    protected float printLoadInfo(LEPin pin, float alpha) {
        StringBuffer buf = new StringBuffer();
        buf.append(getType().toString());
        buf.append("\tSize="+TextUtils.formatDouble(leX, 2));
        buf.append("\tLE="+TextUtils.formatDouble(pin.getLE(), 2));
        buf.append("\tM="+TextUtils.formatDouble(mfactor, 2));
        float load;
        if (pin.getDir() == LEPin.Dir.OUTPUT) {
            load = (float)(leX*pin.getLE()*mfactor*alpha);
            buf.append("\tAlpha="+alpha);
            buf.append("\tLoad="+TextUtils.formatDouble(load, 2));
        } else {
            load = (float)(leX*pin.getLE()*mfactor);
            buf.append("\tLoad="+TextUtils.formatDouble(load, 2));
        }
        buf.append("\t"+getName());
        System.out.println(buf.toString());
        return load;
    }
}