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Diffstat (limited to 'ext/dsent/model/electrical/Decoder.cc')
| -rw-r--r-- | ext/dsent/model/electrical/Decoder.cc | 235 |
1 files changed, 235 insertions, 0 deletions
diff --git a/ext/dsent/model/electrical/Decoder.cc b/ext/dsent/model/electrical/Decoder.cc new file mode 100644 index 000000000..7629bf8b2 --- /dev/null +++ b/ext/dsent/model/electrical/Decoder.cc @@ -0,0 +1,235 @@ +#include "model/electrical/Decoder.h" + +#include <cmath> + +#include "model/PortInfo.h" +#include "model/EventInfo.h" +#include "model/TransitionInfo.h" +#include "model/std_cells/StdCellLib.h" +#include "model/std_cells/StdCell.h" + +namespace DSENT +{ + using std::ceil; + + Decoder::Decoder(const String& instance_name_, const TechModel* tech_model_) + : ElectricalModel(instance_name_, tech_model_) + { + initParameters(); + initProperties(); + } + + Decoder::~Decoder() + {} + + void Decoder::initParameters() + { + addParameterName("NumberOutputs"); + } + + void Decoder::initProperties() + { + return; + } + + Decoder* Decoder::clone() const + { + // TODO + return NULL; + } + + void Decoder::constructModel() + { + // Get parameters + unsigned int number_outputs = getParameter("NumberOutputs").toUInt(); + + ASSERT(number_outputs > 0, "[Error] " + getInstanceName() + " -> Number of outputs must be > 0!"); + + unsigned int number_addr_bits = (unsigned int)ceil(log2(number_outputs)); + + // Create ports + for(unsigned int i = 0; i < number_addr_bits; ++i) + { + createInputPort("Addr" + (String)i); + } + for(unsigned int i = 0; i < number_outputs; ++i) + { + createOutputPort("Out" + (String)i); + } + + // Create energy, power, and area results + createElectricalResults(); + createElectricalEventResult("Decode"); + Result* decode_event = getEventResult("Decode"); + + getEventInfo("Idle")->setStaticTransitionInfos(); + + if(number_addr_bits == 0) + { + // Do not need a decoder + } + else if(number_addr_bits == 1) + { + const String& inv0_name = "Inv0"; + + StdCell* inv0 = getTechModel()->getStdCellLib()->createStdCell("INV", inv0_name); + inv0->construct(); + + // Connect inputs and outputs + portConnect(inv0, "A", "Addr0"); + portConnect(inv0, "Y", "Out0"); + assign("Out1", "Addr0"); + + // Add area, power, and event results + addSubInstances(inv0, 1.0); + addElectricalSubResults(inv0, 1.0); + decode_event->addSubResult(inv0->getEventResult("INV"), inv0_name, 1.0); + } + else + { + unsigned int number_addr_bits_0 = (unsigned int)ceil((double)number_addr_bits / 2.0); + unsigned int number_addr_bits_1 = (unsigned int)floor((double)number_addr_bits / 2.0); + + unsigned int number_outputs_0 = (unsigned int)pow(2.0, number_addr_bits_0); + unsigned int number_outputs_1 = (unsigned int)ceil((double)number_outputs / (double)number_outputs_0); + + const String& dec0_name = "Dec_way0"; + const String& dec1_name = "Dec_way1"; + vector<String> nand2_names(number_outputs, ""); + vector<String> inv_names(number_outputs, ""); + for(unsigned int i = 0; i < number_outputs; ++i) + { + nand2_names[i] = "NAND2_" + (String)i; + inv_names[i] = "INV_" + (String)i; + } + + Decoder* dec0 = new Decoder(dec0_name, getTechModel()); + dec0->setParameter("NumberOutputs", number_outputs_0); + dec0->construct(); + + Decoder* dec1 = new Decoder(dec1_name, getTechModel()); + dec1->setParameter("NumberOutputs", number_outputs_1); + dec1->construct(); + + vector<StdCell*> nand2s(number_outputs, NULL); + vector<StdCell*> invs(number_outputs, NULL); + for(unsigned int i = 0; i < number_outputs; ++i) + { + nand2s[i] = getTechModel()->getStdCellLib()->createStdCell("NAND2", nand2_names[i]); + nand2s[i]->construct(); + invs[i] = getTechModel()->getStdCellLib()->createStdCell("INV", inv_names[i]); + invs[i]->construct(); + } + + // Connect inputs and outputs + for(unsigned int i = 0; i < number_addr_bits_0; ++i) + { + portConnect(dec0, "Addr" + (String)i, "Addr" + (String)i); + } + for(unsigned int i = 0; i < number_addr_bits_1; ++i) + { + portConnect(dec1, "Addr" + (String)i, "Addr" + (String)(i + number_addr_bits_0)); + } + for(unsigned int i = 0; i < number_outputs_0; ++i) + { + createNet("way0Out" + (String)i); + portConnect(dec0, "Out" + (String)i, "way0Out" + (String)i); + } + for(unsigned int i = 0; i < number_outputs_1; ++i) + { + createNet("way1Out" + (String)i); + portConnect(dec1, "Out" + (String)i, "way1Out" + (String)i); + } + + for(unsigned int i = 0; i < number_outputs; ++i) + { + createNet("nand" + (String)i + "Out"); + portConnect(nand2s[i], "A", "way0Out" + (String)(i%number_outputs_0)); + portConnect(nand2s[i], "B", "way1Out" + (String)((unsigned int)floor(i/number_outputs_0))); + portConnect(nand2s[i], "Y", "nand" + (String)i + "Out"); + portConnect(invs[i], "A", "nand" + (String)i + "Out"); + portConnect(invs[i], "Y", "Out" + (String)i); + } + + // Add area, power, and event results + addSubInstances(dec0, 1.0); + addElectricalSubResults(dec0, 1.0); + decode_event->addSubResult(dec0->getEventResult("Decode"), dec0_name, 1.0); + addSubInstances(dec1, 1.0); + addElectricalSubResults(dec1, 1.0); + decode_event->addSubResult(dec1->getEventResult("Decode"), dec1_name, 1.0); + for(unsigned int i = 0; i < number_outputs; ++i) + { + addSubInstances(nand2s[i], 1.0); + addElectricalSubResults(nand2s[i], 1.0); + decode_event->addSubResult(nand2s[i]->getEventResult("NAND2"), nand2_names[i], 1.0); + + addSubInstances(invs[i], 1.0); + addElectricalSubResults(invs[i], 1.0); + decode_event->addSubResult(invs[i]->getEventResult("INV"), inv_names[i], 1.0); + } + } + return; + } + + void Decoder::propagateTransitionInfo() + { + // The only thing can be updated are the input probabilities + unsigned int number_outputs = getParameter("NumberOutputs").toUInt(); + + unsigned int number_addr_bits = (unsigned int)ceil(log2(number_outputs)); + + if(number_addr_bits == 0) + { + // Do not need a decoder + } + else if(number_addr_bits == 1) + { + ElectricalModel* inv0 = (ElectricalModel*)getSubInstance("Inv0"); + propagatePortTransitionInfo(inv0, "A", "Addr0"); + inv0->use(); + + // Since # addr bits is 1, the output 0 is directly connected + propagatePortTransitionInfo("Out0", inv0, "Y"); + propagatePortTransitionInfo("Out1", "Addr0"); + } + else + { + unsigned int number_addr_bits_0 = (unsigned int)ceil((double)number_addr_bits / 2.0); + unsigned int number_addr_bits_1 = (unsigned int)floor((double)number_addr_bits / 2.0); + + unsigned int number_outputs_0 = (unsigned int)pow(2.0, number_addr_bits_0); + + // Update decoders with probabilities + ElectricalModel* dec0 = (ElectricalModel*)getSubInstance("Dec_way0"); + for(unsigned int i = 0; i < number_addr_bits_0; ++i) + { + propagatePortTransitionInfo(dec0, "Addr" + (String)i, "Addr" + (String)i); + } + dec0->use(); + ElectricalModel* dec1 = (ElectricalModel*)getSubInstance("Dec_way1"); + for(unsigned int i = 0; i < number_addr_bits_1; ++i) + { + propagatePortTransitionInfo(dec1, "Addr" + (String)i, "Addr" + (String)(i + number_addr_bits_0)); + } + dec1->use(); + + for(unsigned int i = 0; i < number_outputs; ++i) + { + ElectricalModel* nand2 = (ElectricalModel*)getSubInstance("NAND2_" + (String)i); + propagatePortTransitionInfo(nand2, "A", dec0, "Out" + (String)(i%number_outputs_0)); + propagatePortTransitionInfo(nand2, "B", dec1, "Out" + (String)((unsigned int)floor(i/number_outputs_0))); + nand2->use(); + + ElectricalModel* inv = (ElectricalModel*)getSubInstance("INV_" + (String)i); + propagatePortTransitionInfo(inv, "A", nand2, "Y"); + inv->use(); + + propagatePortTransitionInfo("Out" + (String)i, inv, "Y"); + } + } + return; + } + +} // namespace DSENT + |