How to Implement Systems chip in OMNeT++

To implement a System-on-Chip (SoC) simulation in OMNeT++  has needs to design and modelling the internal architecture of a SoC that has contains the processors, memory, interconnects, and peripherals. The given below are the procedures to execute the implementing a basic SoC simulation in OMNeT++ with practical examples.

Step-by-Step Implementation:

1. Define the System-on-Chip Architecture

• Components: Identify the key components of SoC, such as:
  • Processors (CPU/GPU)
  • Memory (RAM/ROM)
  • Interconnects (bus, network-on-chip)
  • Peripherals (I/O controllers, sensors)
• Communication: Decide how these components will interact through buses or network-on-chip.

2. Create OMNeT++ Modules for Each Component

• Processor Module: Model the CPU and its interactions.
• Memory Module: To mimic memory operations like reads and writes.
• Interconnect Module: Execute communication among the components.
• Peripheral Modules: Model any additional components such as I/O devices or sensors.

Example: Basic Processor Module

simple Processor {

parameters:

double clockFrequency @unit(“GHz”) = default(1.0); // Example parameter

gates:

inout dataIn;  // For receiving data

inout dataOut; // For sending data

// Processor-specific parameters and gates

}

Example: Memory Module

simple Memory {

parameters:

int memorySize @unit(“MB”) = default(1024); // Example parameter

gates:

inout memIn;   // For receiving data requests

inout memOut;  // For sending data responses

// Memory-specific parameters and gates

}

3. Implement the Internal Logic of Each Component

• Processor Logic: To emulate the simple instruction execution, processing delays, and communication with memory.
• Memory Logic: Execute memory read/write operations and latency simulation.
• Interconnect Logic: To mimic the data transfer delays and arbitration (if using a bus).

Example: Processor Logic in C++

#include <omnetpp.h>

class Processor : public omnetpp::cSimpleModule {

protected:

virtual void handleMessage(omnetpp::cMessage *msg) override;

};

Define_Module(Processor);

void Processor::handleMessage(omnetpp::cMessage *msg) {

// Simulate processing delay

scheduleAt(simTime() + 1 / par(“clockFrequency”).doubleValue(), msg);

// Example: Forward the message after processing

send(msg, “dataOut”);

}

Example: Memory Logic in C++

#include <omnetpp.h>

class Memory : public omnetpp::cSimpleModule {

protected:

virtual void handleMessage(omnetpp::cMessage *msg) override;

};

Define_Module(Memory);

void Memory::handleMessage(omnetpp::cMessage *msg) {

// Simulate memory access delay

scheduleAt(simTime() + 0.001, msg); // Example delay

// Example: Send the response back

send(msg, “memOut”);

}

4. Implement the Interconnect (Bus or Network-on-Chip)

• Bus Interconnect: Simple point-to-point or bus-based communication.
• Network-on-Chip (NoC): More complex interconnects has contains the routing, multiple nodes, etc.

Example: Bus Interconnect Logic

simple Bus {

gates:

inout port[4]; // Example bus with 4 ports for simplicity

connections:

// Connect components to the bus

port[0] <–> port[1];

port[2] <–> port[3];

// Additional bus-specific logic

}

5. Integrate the Components in a NED File

• Describe the connections among the processor, memory, and peripherals through the interconnection.
• Setup the simulation using OMNeT++’s .ini files to set the metrics such as clock speeds, memory sizes, and delays.

Example: System Integration in NED

network SoC {

submodules:

cpu: Processor {

parameters:

clockFrequency = 2.0; // 2 GHz CPU

}

ram: Memory {

parameters:

memorySize = 4096; // 4 GB RAM

}

bus: Bus;

connections allowunconnected:

cpu.dataOut –> bus.port[0];

ram.memIn <– bus.port[1];

bus.port[2] –> ram.memOut;

cpu.dataIn <– bus.port[3];

}

6. Run and Analyse the Simulation

• Compile: make sure that all modules are compiled in OMNeT++.
• Execute: execute the simulation and track the communication among numerous components.
• Analyse: Use OMNeT++ tools to evaluate the data flow, latencies, and bottlenecks.

7. Advanced Features

• Power Modelling: To execute the power consumption models for various components.
• Timing Analysis: To emulate and measure the timing constraints and performance metrics.
• Fault Injection: Establish faults is associated or components to study the resilience of SoC model.

Example Use Case: Data Processing Workflow

1. CPU: Issues a read request to the memory through the bus.
2. Memory: Processes the request, adds access delay, and sends the information back through the bus.
3. CPU: Receives the data and continues processing, possibly communicating with peripherals.
4. Bus: To manage the multiple requests and handles the access to distributed resources.

In the entire module, we had clearly known how to mimic the system-on-chip in the OMNeT++ tool. We provide more information related to the system-on-chip.

For executing the Systems chip in your OMNeT++ project, omnet-manual.com will serve as your reliable partner. We are prepared to provide you with implementation support.