Engg Technical notes

Looping Statements in Verilog – forever, repeat, while, and for Explained In Verilog , looping statements are used to execute a block of code multiple times , just like in traditional programming languages such as C or Python. However, in Verilog, loops are allowed only inside procedural blocks like initial or always . These loops help designers perform repetitive tasks efficiently — such as generating clocks, testing data, or initializing memories. Let’s explore the four types of looping statements in Verilog with syntax, examples, and clear explanations. 🧩 Types of Looping Statements in Verilog Verilog supports the following four types of loops: forever repeat while for 🟠 1. The forever Loop The forever statement runs continuously without end . As its name suggests, it repeats the block of code indefinitely — until the simulation is manually stopped or a $finish statement is reached. This type of loop is often used in testbenches for generating fr...

 The Conditional Statement in Verilog: if-else, case, casex, and casez Explained In digital design, conditional statements are the backbone of decision-making in hardware description languages like Verilog . They control the flow of execution in your code, determining which set of statements should execute when certain conditions are met. In this post, we’ll explore the if-else , nested if , parallel if , and case statements — including their special forms casez and casex — with clear syntax, examples, and simulation outputs. 🔹 Understanding Conditional Statements in Verilog Conditional statements help you control when and how certain parts of your Verilog code execute. These are mainly used inside procedural blocks such as always or initial . The key conditional statements are: if and if-else nested if-else parallel if case , casez , and casex ⚙️ 1. The if-else Statement in Verilog The if-else statement is used to make decisions based on conditi...

Verilog HDL ( Hardware Description Language ) is widely used for modeling digital systems. It allows designers to describe circuits at different levels of abstraction , making it easier to go from high-level behavior to gate-level implementation . In this guide, we’ll explore these abstraction levels, procedural blocks , and important Verilog constructs with practical examples. Abstraction Levels in Verilog Verilog supports multiple modeling styles depending on the level of detail required: Behavioral Modeling Describes the functionality of the design rather than its structure. Suitable for quick prototyping. Example: writing algorithms for counters , FSMs , or arithmetic operations. RTL (Register Transfer Level) Modeling Describes the design in terms of data flow between registers and logic. Mostly used for synthesis into hardware . Structural Modeling Describes how gates, flip-flops, and modules are interconnected. Used for low-level represent...

Learning Verilog becomes much easier when you master operators . Just like in C or Java , operators in Verilog help perform mathematical, logical, relational, and bit-level operations . Whether you’re simulating a design or writing RTL code , operators simplify coding and make it more readable. In this blog, we’ll explore all Verilog operators with clear explanations, syntax, and practical examples. 🔹 1. Arithmetic Operators Arithmetic operators work on numbers (integers, registers, parameters). Binary Operators : + , - , * , / , % Unary Operators : + , - 👉 Key Points: Integer division truncates fractions. Modulus % takes the sign of the first operand. If operands contain unknown x , the result is x . 📌 Example: module arithmetic_operators(); initial begin $display (" 5 + 10 = %d", 5 + 10); $display (" 10 * 5 = %d", 10 * 5); $display (" 10 / -5 = %d", 10 / -5); $display (" 10 % 3 = %d", 10 % 3); $display ...