Application of Time Delays

Appendices: P02

Applying time delays.

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Simulate Glitch and Delay

Project 7: Simulate Glitch and Delay in Combinational Circuits

In this project, we are going to examine the delay in combinational circuits. We are going to tell the simulator of the delay of each gate in Verilog and simulate the circuits to see how delay can affect the behavior of a combinational circuit.

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Delay of Combinational Circuits

Propagation Delays

Time is required to process information in digital circuits. This processing time is divided between the less significant signal transmission time, and the more significant propagation delays associated with switching logic circuits. If not managed properly, propagation delays can result in logic circuits that run too slowly to meet their requirements, or that fail altogether.

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Glitches

Propagation delays not only limit the speed at which a circuit can operate, they can also cause unexpected and unwanted transitions in outputs. These unwanted transitions, called “glitches”, result when an input signal changes state, provided the signal takes two or more paths through a circuit and one path has a longer delay than the other.

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Non-Blocking Delays

This page discusses the concept of non-blocking delays as a way to allow multiple periodic events to occur while allowing other functions to run during the time between calls.

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Simulate Glitch and Delay

Vivado Project 7: Simulate Glitch and Delay in Combinational Circuits

In this project, we are going to examine the delay in combinational circuits. We are going to tell the simulator of the delay of each gate in Verilog and simulate the circuits to see how delay can affect the behavior of a combinational circuit.

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×