Engg Technical notes

1. Introduction In Verilog HDL (Hardware Description Language), designers frequently need to reuse code blocks, perform computations, or model specific behaviors. To achieve modularity and reduce repetitive coding, Verilog provides two procedural constructs: tasks and functions . While both tasks and functions encapsulate reusable code, they serve different purposes : Functions return a single value and execute in zero simulation time . They are ideal for combinational computations . Tasks can handle multiple outputs, include timing control statements (like # , @ , and wait ), and are used in sequential or complex behavioral modeling . This tutorial provides a detailed exploration of tasks and functions, their syntax, usage, examples, and best practices — equipping hardware designers and students to model and simulate Verilog designs effectively. 2. Understanding Tasks in Verilog A task is a procedural block in Verilog that encapsulates code which can be executed mu...

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...