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Functional and Timing Simulation of a One-Bit Comparator Using Xilinx

This tutorial provides a step-by-step guide on performing functional and timing simulations using Xilinx software, focusing on a one-bit comparator as the example circuit. It covers essential tasks including opening the simulator, selecting input and output signals, adding signal components, and defining stimuli. You will learn how to conduct both functional and timing simulations, view waveforms, and measure delays, enhancing your understanding of digital design verification.

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Functional and Timing Simulation of a One-Bit Comparator Using Xilinx

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Presentation Transcript

  1. Tutorial 5:Simulating a Design

  2. Introduction • This tutorial covers how to perform a functional simulation as well as a timing simulation with the Xilinx software. • A one-bit comparator was chosen as the example circuit.

  3. One-Bit Comparator

  4. Opening the Simulator • Simulation Icon • Tools -> Simulation/Verification -> Gate Simulator • Update Netlist

  5. Selecting input and output signals • Chip Icon • Signal -> Add Signal

  6. Component Selection • Select Inputs and Outputs • Add button • Double-Clicking • Close button

  7. Test Pins • SC button • Tools -> Schematic Capture • Simulation Toolbox Icon • Mode -> Testpoint • Click on net name to create probe • Sim Icon to return

  8. Adding Stimuli • Stimulator icon • Signal -> Add Stimulators • Binary Counter to mark inputs • Close Stimulator window

  9. Defining the Frequency of the free-running Counter • Options -> Preferences • B0 Period drop-down list • B0 Frequency adjusts automatically

  10. Doing the Simulation and Viewing the Waveforms • “Functional” from pull down menu • Simulation Step (footstep) • Adjust step size with pull down menu • Ruler Icon – adjust scale of time axis

  11. Schematic Simulation • SC Icon • Logic Values of each signal • Gray Boxes -> Colored Boxes

  12. Timing Simulation • Detailed information of timing delays • First implement design – Implementation Icon • Verification Button (Timing Simulation) • Select components from Signals Selection and Chip Selection • Close to return

  13. Doing the Simulation and Measuring Delays • “Timing” from pull down menu • Step Icon (footsteps) • Measure Delay – Waveform -> Measurements -> Measurements on • Select start and end points

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