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