tutorial 5: simulating a design. introduction this tutorial covers how to perform a functional...
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Tutorial 5:Simulating a Design
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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.
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One-Bit Comparator
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Opening the Simulator
Simulation Icon
Tools -> Simulation/Verification -> Gate Simulator
Update Netlist
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Selecting input and output signals
Chip Icon
Signal -> Add Signal
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Component Selection
Select Inputs and Outputs
Add button
Double-Clicking
Close button
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Test Pins
SC button
Tools -> Schematic Capture
Simulation Toolbox Icon
Mode -> Testpoint
Click on net name to create probe
Sim Icon to return
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Adding Stimuli
Stimulator icon
Signal -> Add Stimulators
Binary Counter to mark inputs
Close Stimulator window
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Defining the Frequency of the free-running Counter
Options -> Preferences
B0 Period drop-down list
B0 Frequency adjusts automatically
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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
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Schematic Simulation
SC Icon
Logic Values of each signal
Gray Boxes -> Colored Boxes
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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
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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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