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Course contents

  • Start Here5
  • SystemVerilog Language Foundations28
    • SystemVerilog Data Types
    • Arrays: Packed, Dynamic, Queues & Associative
    • Procedural Code & Scheduling
    • Operators, Expressions & Width Rules
    • Packages, Typedefs & Compilation
      • Packages & Imports
      • Compilation Units & Compile Order
      • typedef, parameter & localparam
      • `include vs import
      • Namespace Hygiene at Scale
    • Interfaces, Modports & Clocking Blocks
  • Object-Oriented SystemVerilog for Verification30
  • Constraint Randomization — Interview-Critical Deep Dive39
  • SystemVerilog Assertions — Interview-Critical Deep Dive41
  • Functional Coverage in SystemVerilog25
  • Testbench Architecture in SystemVerilog24
  • Advanced Language & Integration26
  • Senior & Interview Preparation23
  • Principal-Level Verification34
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←SystemVerilog Language Foundations
  1. Topics
  2. SystemVerilog
  3. SystemVerilog Language Foundations
  4. Packages, Typedefs & Compilation

Part 1 of 9Part 1 of 9/Language FoundationsIntermediate

Packages, Typedefs & Compilation

Packages, imports, compilation order, parameters and namespace rules for scalable testbenches.

  • 5topics
  • 5lessons

Protocols, configuration and utilities live in packages: named namespaces the compiler elaborates once and every file references. The lessons below build that discipline from declaration to scale.

A package is compiled first and referenced everywhere; an include only pastes text.

Lesson

Path

What you build

Packages & Imports

Required

One protocol package read three ways, plus an umbrella package.

Compilation Units & Compile Order

Recommended

A filelist in dependency order and a fix for undefined-type errors. Recommended because every learner hits the undefined-type error sooner or later.

typedef, parameter & localparam

Required

One package of widths flowing into a DUT and a depth-overridden fifo.

`include vs import

Recommended

A guarded header included twice, and which mechanism shares what.

Namespace Hygiene at Scale

Optional

Later reading: two vendor protocols side by side without collisions. Optional until your bench imports more than one package.

Path: Required is the core first pass for this part's goal, a self-checking testbench; Recommended is what most learners should read; Optional is reference, specialist or revision material to return to later.

Check yourself Two modules pass one header struct between them, and the compiler says the types do not match although every field is the same. What went wrong?

Each module got its own copy of the struct, for example by including the same file in both, so there are two different types. Put one typedef in one package and import it on both sides.

“Why did you get an undefined-type error and how did you fix it” separates engineers who have built environments from those who have only read about them. The answer is always compile order or compilation-unit scope, and the fix is a package plus a filelist.

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See also

  • SystemVerilog Data Types
  • Arrays: Packed, Dynamic, Queues & Associative
  • Procedural Code & Scheduling