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Скачать или смотреть How to Randomize Real Numbers in Exponential Format for Verilog Design

  • vlogize
  • 2025-04-06
  • 1
How to Randomize Real Numbers in Exponential Format for Verilog Design
Randomize real numbers in exponential formatverilogsystem verilog
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Описание к видео How to Randomize Real Numbers in Exponential Format for Verilog Design

Learn how to effectively randomize real numbers in exponential format to create realistic simulation delays in your Verilog designs.
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This video is based on the question https://stackoverflow.com/q/77194549/ asked by the user 'akhmathew' ( https://stackoverflow.com/u/22623559/ ) and on the answer https://stackoverflow.com/a/77198756/ provided by the user 'dave_59' ( https://stackoverflow.com/u/2755607/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

Visit these links for original content and any more details, such as alternate solutions, latest updates/developments on topic, comments, revision history etc. For example, the original title of the Question was: Randomize real numbers in exponential format

Also, Content (except music) licensed under CC BY-SA https://meta.stackexchange.com/help/l...
The original Question post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license, and the original Answer post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license.

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The Challenge of Randomizing Real Numbers in Exponential Format

In the field of digital design and verification, randomization plays a crucial role in creating robust simulations. However, when working with Verilog or System Verilog, you might face issues when trying to randomize real numbers, especially if they're provided in exponential format.

When parameters for delays are defined as real numbers, such as MIN_DELAY = 1e-8 or MAX_DELAY = 5e-6, using the $urandom_range function can become tricky as it only accepts integer values. A typical approach involves converting these real delays into integers, but this can lead to unexpected results during simulation.

Let's dive into the problem and explore a clear, effective solution.

Understanding the Problem

When attempting to randomize delays in your buffer module, you might notice irregularities in your calculations. For instance:

You start with parameters defined as real numbers.

You attempt to convert these into integer format for $urandom_range.

A loop condition might lead to excessively large integer values instead of appropriately ending when certain conditions are met.

Here’s a snippet demonstrating the typical code and the resulting unexpected behavior seen when using real numbers:

[[See Video to Reveal this Text or Code Snippet]]

Unfortunately, this approach can lead to values spiraling out of control, showcasing delays that are larger than expected.

The Solution: A Better Approach to Randomizing Delays

Step 1: Update the Display Format

First, you can improve the display format to provide better precision and clarity in your debugging. Use the following display instruction:

[[See Video to Reveal this Text or Code Snippet]]

This ensures that you handle small values within a wider range of precision.

Step 2: Preserve Real Number Fidelity While Randomizing

Next, instead of dealing with integer conversions, you can directly work with the parameters using the following code:

[[See Video to Reveal this Text or Code Snippet]]

Explanation of the Code:

Parameter Definitions: Defines the minimum and maximum delays directly as real parameters.

Integer Conversion: Converts these real delays to integer format in a way that respects simulation time units (1ps).

Using $urandom_range: Directly creates a random delay between max_delay and min_delay, applying the unit conversion back to real format by multiplying with 1ps.

Conclusion

By utilizing the above approaches, you can effectively randomize real numbers formatted in exponential notation within your Verilog designs. This technique will help you manage simulation delays better, preserving both accuracy and efficiency in your design workflow.

This simple method eliminates unexpected values and results in a more reliable simulation environment focused on real-time calculations.

Further Reading

Consider exploring more on System Verilog's randomization facilities for enhanced control over your design logic.

Remember, proper debugging will often reveal underlying issues—using clear formats helps visualize what’s happening with your real number randomization!

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