Verilog 13: Procedural Block Control in Verilog
Understanding Procedural Block Control in Verilog In Verilog, procedural blocks form the foundation for describing behavioral models of hardware. These blocks define how a circuit reacts to inputs over time — enabling both combinational and sequential logic modeling. Procedural blocks become active at simulation time zero and execute when triggered by events or signal changes defined in their sensitivity list . Let’s explore how procedural control works, along with key examples and best coding practices. 🔹 What Are Procedural Blocks? Procedural blocks are code regions that describe behavior rather than structure. They are defined using either of the two keywords: always → executes continuously throughout simulation. initial → executes once at simulation start. These blocks can be controlled using event controls such as level or edge triggers . 🧩 Example 1 – D Latch Using always Block Let’s begin with a basi...