Behavioral Modeling Lecture Notes

Introduction

• Lecturer: Megha Mahla
• Department: Electronics and Communication
• Focus: Definitions and terminology in Behavioral Modeling (Unit Module 3)

Behavioral Modeling Overview

• High level of abstraction modeling
• Uses procedural assignment statements
• Execution of statements is sequential
• Manipulates and simulates variables of each data type

Key Terminology

• Ascent: A keyword used in behavioral modeling
• Always: A keyword to begin procedural blocks
• Assignment Statements: Left side (variables), Right side (expression)
• Procedural Constructs: Constructs like 'always' that control simulation

Procedural Constructs

• Always Procedural Block: Executes statements repeatedly within the loop
• Assign/De-assign: Keywords for adding or omitting values to/from data types
• Force/Release: Similar to assign/de-assign for manipulating code values

Types of Assignment Statements

• Continuous Assignment: Implicit and explicit
• Procedural Assignment: Used for updating register and memory data types
  • Blocking Assignments: Evaluated sequentially; use '='
  • Non-blocking Assignments: Evaluated concurrently; use '<='

Delays and Control

• Fixed Delays: No change on procedural assignments
• Wait Keyword: Used for evaluating expressions to be true or false

Looping Statements

• For Loop: Most widely used for replicating hardware logic
  • Structure: Initialization, Condition, Update
  • Example: for (i = 0; i < 10; i++) { ... }
• Conditional Statements:
  • If Statement: Makes decisions based on condition
  • While Loop: Executes until condition is no longer true

Weight Construct

• Makes simulator wait for specific expressions to be true
• Types:
  • Wait Until: Synthesizable, waits until condition is true
  • Wait On: Holds system until defined signal change
  • Wait For: Non-synthesizable, holds system for a defined time

Construct Keywords

• Always: Used in timing control and procedural assignments
• Fork/Join: Parallel execution of procedural assignments

Summary

• Behavioral modeling involves high-level constructs and loops for effective simulation and synthesis.
• Different assignment types and constructs provide flexibility and control.
• Understanding constructs like blocking, non-blocking, and looping is essential for modeling.

Exam Tips

• Emphasize examples, especially for constructs like 'wait'
• Highlight differences and uses of each type of loop and assignment

Conclusion

• Ensure understanding of definitions and terminology in Behavioral Modeling Module 3.
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