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Diffstat (limited to 'ext/dsent/model/electrical/Multiplexer.cc')
| -rw-r--r-- | ext/dsent/model/electrical/Multiplexer.cc | 347 |
1 files changed, 347 insertions, 0 deletions
diff --git a/ext/dsent/model/electrical/Multiplexer.cc b/ext/dsent/model/electrical/Multiplexer.cc new file mode 100644 index 000000000..f51f43b4c --- /dev/null +++ b/ext/dsent/model/electrical/Multiplexer.cc @@ -0,0 +1,347 @@ +#include "model/electrical/Multiplexer.h" + +#include <cmath> + +#include "model/PortInfo.h" +#include "model/TransitionInfo.h" +#include "model/EventInfo.h" +#include "model/timing_graph/ElectricalDriverMultiplier.h" +#include "model/timing_graph/ElectricalNet.h" +#include "model/std_cells/StdCell.h" +#include "model/std_cells/StdCellLib.h" + +namespace DSENT +{ + Multiplexer::Multiplexer(const String& instance_name_, const TechModel* tech_model_) + : ElectricalModel(instance_name_, tech_model_) + { + initParameters(); + initProperties(); + } + + Multiplexer::~Multiplexer() + {} + + void Multiplexer::initParameters() + { + addParameterName("NumberInputs"); + addParameterName("NumberBits"); + addParameterName("BitDuplicate", "TRUE"); + addParameterName("IsTopLevel", "TRUE"); + return; + } + + void Multiplexer::initProperties() + { + return; + } + + Multiplexer* Multiplexer::clone() const + { + return NULL; + } + + void Multiplexer::constructModel() + { + // Get parameters + unsigned int number_bits = (unsigned int) getParameter("NumberBits"); + unsigned int number_inputs = (unsigned int) getParameter("NumberInputs"); + unsigned int number_selects = (unsigned int) ceil(log2((double) number_inputs)); + bool bit_duplicate = (bool) getParameter("BitDuplicate"); + bool is_top_level = getParameter("IsTopLevel").toBool(); + + ASSERT(number_inputs > 0, "[Error] " + getInstanceName() + " -> Number of inputs must be > 0!"); + ASSERT(number_bits > 0, "[Error] " + getInstanceName() + " -> Number of bits must be > 0!"); + + //Construct electrical ports and nets + //Create each input port + for(unsigned int i = 0; i < number_inputs; ++i) + createInputPort( "In" + (String) i, makeNetIndex(0, number_bits-1)); + //Create select signals + for(unsigned int i = 0; i < number_selects; ++i) + { + createInputPort( "Sel" + (String)i); + } + //Create output + createOutputPort( "Out", makeNetIndex(0, number_bits-1)); + + //Create energy, power, and area results + createElectricalResults(); + getEventInfo("Idle")->setStaticTransitionInfos(); + createElectricalEventResult("Mux"); + + //Number of inputs on the 0 side + unsigned int inputs_0 = (unsigned int) ceil((double) number_inputs / 2.0); + unsigned int selects_0 = (unsigned int) ceil(log2((double) inputs_0)); + //Number of inputs on the 1 side + unsigned int inputs_1 = (unsigned int) floor((double) number_inputs / 2.0); + unsigned int selects_1 = (unsigned int) ceil(log2((double) inputs_1)); + + //Depending on whether we want to create a 1-bit instance and have it multiplied + //up by number of bits or actually instantiate number_bits of 1-bit instances. + //Recursively instantiates smaller multiplexers + if (bit_duplicate || number_bits == 1) + { + //If it is just a 1-input multiplexer, just connect output to input and be done + if (number_inputs == 1) + { + assign("Out", "In0"); + } + else + { + //If it is more than 1 input, instantiate two sub multiplexers (Mux_way0 and Mux_way1) + //and create a final 2:1 mux (muxf) to select between them + String mux0_name = "Mux_way0"; + String mux1_name = "Mux_way1"; + String muxf_name = "Mux2_i" + (String)number_inputs; + + Multiplexer* mux0 = new Multiplexer(mux0_name, getTechModel()); + mux0->setParameter("NumberInputs", inputs_0); + mux0->setParameter("NumberBits", 1); + mux0->setParameter("BitDuplicate", "TRUE"); + mux0->setParameter("IsTopLevel", "FALSE"); + mux0->construct(); + + Multiplexer* mux1 = new Multiplexer(mux1_name, getTechModel()); + mux1->setParameter("NumberInputs", inputs_1); + mux1->setParameter("NumberBits", 1); + mux1->setParameter("BitDuplicate", "TRUE"); + mux1->setParameter("IsTopLevel", "FALSE"); + mux1->construct(); + + StdCell* muxf = getTechModel()->getStdCellLib()->createStdCell("MUX2", muxf_name); + muxf->construct(); + + // TODO hack + // create selector driver at the top level + if(is_top_level) + { + for(unsigned int i = 0; i < number_selects; ++i) + { + StdCell* selinv0 = getTechModel()->getStdCellLib()->createStdCell("INV", String::format("Sel%dInv0", i)); + StdCell* selinv1 = getTechModel()->getStdCellLib()->createStdCell("INV", String::format("Sel%dInv1", i)); + selinv0->construct(); + selinv1->construct(); + + addSubInstances(selinv0, 1.0); + addElectricalSubResults(selinv0, 1.0); + addSubInstances(selinv1, 1.0); + addElectricalSubResults(selinv1, 1.0); + getEventResult("Mux")->addSubResult(selinv0->getEventResult("INV"), String::format("Sel%dInv0", i), 1.0); + getEventResult("Mux")->addSubResult(selinv1->getEventResult("INV"), String::format("Sel%dInv1", i), 1.0); + } + } + + //Create outputs of way0 and way1 multiplexers with final mux + createNet("way0Out"); + createNet("way1Out"); + portConnect(mux0, "Out", "way0Out"); + portConnect(mux1, "Out", "way1Out"); + portConnect(muxf, "A", "way0Out"); + portConnect(muxf, "B", "way1Out"); + + // TODO hack + // Connect selector bits + if(is_top_level) + { + for(unsigned int i = 0; i < number_selects; ++i) + { + ElectricalModel* selinv0 = (ElectricalModel*)getSubInstance(String::format("Sel%dInv0", i)); + ElectricalModel* selinv1 = (ElectricalModel*)getSubInstance(String::format("Sel%dInv1", i)); + createNet("SelInv" + (String)i); + createNet("SelBuf" + (String)i); + portConnect(selinv0, "A", "Sel" + (String)i); + portConnect(selinv0, "Y", "SelInv" + (String)i); + portConnect(selinv1, "A", "SelInv" + (String)i); + portConnect(selinv1, "Y", "SelBuf" + (String)i); + } + } + //Connect inputs to the sub multiplexers. + //Note that multiple inputs are connected to the mux0 and mux1 input and the + //selector signals are connected multiple times. This is just so that everything + //is loaded appropriately since bit duplication is applied + for (unsigned int n = 0; n < number_bits; ++n) + { + //Connect inputs + for (unsigned int i = 0; i < inputs_0; ++i) + portConnect(mux0, "In" + (String) i, "In" + (String) i, makeNetIndex(n)); + for (unsigned int i = 0; i < inputs_1; ++i) + portConnect(mux1, "In" + (String) i, "In" + (String) (i + inputs_0), makeNetIndex(n)); + // TODO hack + if(is_top_level) + { + //Connect selector bits + for (unsigned int i = 0; i < selects_0; ++i) + portConnect(mux0, "Sel" + (String)i, "SelBuf" + (String)i); + for (unsigned int i = 0; i < selects_1; ++i) + portConnect(mux1, "Sel" + (String)i, "SelBuf" + (String)i); + portConnect(muxf, "S0", "SelBuf" + (String)(number_selects - 1)); + } + else + { + //Connect selector bits + for (unsigned int i = 0; i < selects_0; ++i) + portConnect(mux0, "Sel" + (String)i, "Sel" + (String)i); + for (unsigned int i = 0; i < selects_1; ++i) + portConnect(mux1, "Sel" + (String)i, "Sel" + (String)i); + portConnect(muxf, "S0", "Sel" + (String)(number_selects - 1)); + } + } + + //Connect final mux to outputs + //Because we use bit duplication and so there is only only one multiplexer + //instance, we must use driver multiplier to drive each output appropriately + if (number_bits == 1) + portConnect(muxf, "Y", "Out"); + else + { + createNet("OutTemp"); + createDriverMultiplier("OutMult"); + ElectricalDriverMultiplier* drive_mult = getDriverMultiplier("OutMult"); + portConnect(muxf, "Y", "OutTemp"); + getNet("OutTemp")->addDownstreamNode(drive_mult); + for (unsigned int n = 0; n < number_bits; ++n) + drive_mult->addDownstreamNode(getNet("Out", makeNetIndex(n))); + } + + //Add area, power, and event results for each mux + addSubInstances(mux0, number_bits); + addElectricalSubResults(mux0, number_bits); + addSubInstances(mux1, number_bits); + addElectricalSubResults(mux1, number_bits); + addSubInstances(muxf, number_bits); + addElectricalSubResults(muxf, number_bits); + getEventResult("Mux")->addSubResult(mux0->getEventResult("Mux"), mux0_name, number_bits); + getEventResult("Mux")->addSubResult(mux1->getEventResult("Mux"), mux1_name, number_bits); + getEventResult("Mux")->addSubResult(muxf->getEventResult("MUX2"), muxf_name, number_bits); + + } + + } + else + { + //Instantiate a bunch of 1-bit multiplexers + for (unsigned int n = 0; n < number_bits; ++n) + { + String mux_name = "Mux_bit" + (String) n; + + Multiplexer* mux = new Multiplexer(mux_name, getTechModel()); + mux->setParameter("NumberInputs", number_inputs); + mux->setParameter("NumberBits", 1); + mux->setParameter("BitDuplicate", "TRUE"); + mux->construct(); + + // Connect inputs + for (unsigned int i = 0; i < number_inputs; ++i) + portConnect(mux, "In" + (String) i, "In" + (String) i, makeNetIndex(n)); + for(unsigned int i = 0; i < number_selects; ++i) + portConnect(mux, "Sel" + (String)i, "Sel" + (String)i); + portConnect(mux, "Out", "Out", makeNetIndex(n)); + + //Add area, power, and event results for each mux + addSubInstances(mux, 1.0); + addElectricalSubResults(mux, 1.0); + getEventResult("Mux")->addSubResult(mux->getEventResult("Mux"), mux_name, 1.0); + } + } + + return; + } + + void Multiplexer::propagateTransitionInfo() + { + // The only thing can be updated are the input probabilities...so we will update them + unsigned int number_bits = (unsigned int) getParameter("NumberBits"); + unsigned int number_inputs = (unsigned int) getParameter("NumberInputs"); + unsigned int number_selects = (unsigned int) ceil(log2((double) number_inputs)); + bool bit_duplicate = (bool) getParameter("BitDuplicate"); + bool is_top_level = getParameter("IsTopLevel").toBool(); + + //Number of inputs on the 0 side + unsigned int inputs_0 = (unsigned int) ceil((double) number_inputs / 2.0); + unsigned int selects_0 = (unsigned int) ceil(log2((double) inputs_0)); + + //Number of inputs on the 1 side + unsigned int inputs_1 = (unsigned int) floor((double) number_inputs / 2.0); + unsigned int selects_1 = (unsigned int) ceil(log2((double) inputs_1)); + + if (bit_duplicate || number_bits == 1) + { + if (number_inputs == 1) + { + //If theres only 1 input, output transition = input transition + propagatePortTransitionInfo("Out", "In0"); + } + else + { + // Update sub muxes with appropriate probabilities + ElectricalModel* mux0 = (ElectricalModel*)getSubInstance("Mux_way0"); + for(unsigned int i = 0; i < inputs_0; ++i) + { + propagatePortTransitionInfo(mux0, "In" + (String)i, "In" + (String)i); + } + for(unsigned int i = 0; i < selects_0; ++i) + { + propagatePortTransitionInfo(mux0, "Sel" + (String)i, "Sel" + (String)i); + } + mux0->use(); + ElectricalModel* mux1 = (ElectricalModel*)getSubInstance("Mux_way1"); + for(unsigned int i = 0; i < inputs_1; ++i) + { + propagatePortTransitionInfo(mux1, "In" + (String)i, "In" + (String)(i + inputs_0)); + } + for(unsigned int i = 0; i < selects_1; ++i) + { + propagatePortTransitionInfo(mux1, "Sel" + (String)i, "Sel" + (String)i); + } + mux1->use(); + ElectricalModel* muxf = (ElectricalModel*)getSubInstance("Mux2_i" + (String)number_inputs); + propagatePortTransitionInfo(muxf, "A", mux0, "Out"); + propagatePortTransitionInfo(muxf, "B", mux1, "Out"); + propagatePortTransitionInfo(muxf, "S0", "Sel" + (String)(number_selects-1)); + muxf->use(); + + // TODO hack + if(is_top_level) + { + for(unsigned int i = 0; i < number_selects; ++i) + { + ElectricalModel* selinv0 = (ElectricalModel*)getSubInstance(String::format("Sel%dInv0", i)); + ElectricalModel* selinv1 = (ElectricalModel*)getSubInstance(String::format("Sel%dInv1", i)); + propagatePortTransitionInfo(selinv0, "A", "Sel" + (String)i); + selinv0->use(); + propagatePortTransitionInfo(selinv1, "A", selinv0, "Y"); + selinv1->use(); + } + } + + // Set output transition + propagatePortTransitionInfo("Out", muxf, "Y"); + } + } + else + { + // Go through each bit and set the appropriate probability + for (unsigned int n = 0; n < number_bits; ++n) + { + ElectricalModel* mux_bit = (ElectricalModel*)getSubInstance("Mux_bit" + (String) n); + for(unsigned int i = 0; i < number_inputs; ++i) + { + propagatePortTransitionInfo(mux_bit, "In" + (String)i, "In" + (String)i); + } + for(unsigned int i = 0; i < number_selects; ++i) + { + propagatePortTransitionInfo(mux_bit, "Sel" + (String)i, "Sel" + (String)i); + } + mux_bit->use(); + } + + // Set output probability to be average that of probabilties of each output bit + ElectricalModel* mux_bit = (ElectricalModel*)getSubInstance("Mux_bit0"); + propagatePortTransitionInfo("Out", mux_bit, "Out"); + } + return; + } + +} // namespace DSENT + |