Tag: Hardware Description Language

Compilation, Elaboration, and Simulation in HDL: A Clear Guide with Examples

July 21, 2025July 18, 2025 vlsifacts No Comments

When working with Hardware Description Languages (HDLs) such as Verilog or VHDL, understanding the design flow is crucial for successful digital circuit development. Three fundamental steps in this flow are Compilation, Elaboration, and Simulation. These steps ensure that your HDL code is syntactically correct, logically consistent, and behaves as expected before hardware implementation. In this article, we will…

Verification, Verilog

Intermediate Verilog Questions for Designers (Part – 2) : Strengthen Your Coding and Design Skills

July 4, 2025July 18, 2025 vlsifacts No Comments

1. What is the difference between synthesis and simulation? 2. How to prevent race conditions in simulations? 3. Difference between ifdef and ifndef? Example of ifdef: Example of ifndef: ifdef and ifndef directives help control conditional compilation, enabling flexible and reusable code for different environments such as simulation, synthesis, debugging, or different target platforms. 4. What is…

Interview, Question Bank, Verilog

When and How to Use While Loops in Verilog: Best Practices and Testbench Examples

July 2, 2025June 30, 2025 vlsifacts No Comments

Loops are essential tools in Verilog for automating repetitive tasks, but not all loops are created equal when it comes to synthesizability and practical use. Among the various loop constructs, the while loop often raises questions because of its dynamic nature. In this blog post, we’ll explore the best use cases for the while loop in Verilog, why it’s…

Verilog

Understanding Different Types of Loops in Verilog: A Beginner’s Guide

July 2, 2025July 2, 2025 vlsifacts No Comments

Loops are fundamental constructs in programming and hardware description languages like Verilog. They help automate repetitive tasks, making your code cleaner, more efficient, and easier to maintain. Whether you are initializing arrays, generating repetitive hardware structures, or creating testbench stimuli, loops are indispensable. In this blog post, we’ll explore the different types of loops available…

Verilog

Intermediate Verilog Questions for Designers (Part – 1) : Strengthen Your Coding and Design Skills

June 27, 2025July 18, 2025 vlsifacts No Comments

1. Model a tri-state buffer in Verilog. 2. Implement a 2-to-1 multiplexer in Verilog using a continuous assignment. 3. Model a combinational circuit using case? 4. How do you model a flip-flop in Verilog? A flip-flop is edge sensitive. The following code represents a positive-edge-triggered D flip-flop that stores the value of d at each rising clock edge. 5. How…

Interview, Question Bank, Verilog

Basic Verilog Questions for Beginners (Part – 3) : Build Your Foundations

June 25, 2025July 18, 2025 vlsifacts No Comments

1. Explain the concept of sensitivity lists in Verilog. A sensitivity list specifies the signals that trigger the execution of an always block when they change. Example: Here, the block executes whenever a or b changes. 2. What is the purpose of generate statements in Verilog? The generate statement is used to dynamically create repetitive hardware structures or conditional instantiations during elaboration. Example: 3. Discuss…

Interview, Question Bank, Verilog

Basic Verilog Questions for Beginners (Part – 2) : Build Your Foundations

June 24, 2025July 18, 2025 vlsifacts No Comments

1. Explain the difference between blocking and non-blocking assignments. Example: 2. What is the difference between posedge and negedge? Example: 3. What is the purpose of the assign statement? The assign statement is used for continuous assignments in combinational logic. It is used to drive values to wire data types. Example: 4. How do you declare a parameter in Verilog? A parameter is…

Interview, Question Bank, Verilog

Basic Verilog Questions for Beginners (Part – 1) : Build Your Foundations

June 24, 2025July 18, 2025 vlsifacts No Comments

1. What is Verilog and why is it used in VLSI design? Verilog is a Hardware Description Language (HDL) widely used to design and model digital electronic systems. It helps in writing structured, reusable code to describe how a circuit should function. Verilog is crucial in VLSI design because it supports simulation, verification, and hardware…

Interview, Question Bank, Verilog

Verilog vs VHDL

July 20, 2015June 23, 2025 Dewansh No Comments

Verilog and VHDL are Hardware Description languages (HDL) that are used to describe the behavior and structure of electronic systems. HDL languages are different form software language like ‘C’, as they use concurrency constructs to simulate circuit behavior. HDL includes a means of describing propagation time and signal strength. Verilog Vs. VHDL

DHD, Verilog, VHDL