Beginner Free 7 hours

PCIe Fundamentals: Transactions and Enumeration

Layers, packets, enumeration, flow control, and ordering.

A rigorous beginner course on PCIe topology, layered packet flow, configuration, enumeration, reliability, flow control, ordering, and completions. The curriculum is grounded in the curated technical references and preserves their technical depth, code, diagrams, decision rules, and failure analysis. Every lesson adds objectives, an applied lab, review questions, and concrete completion evidence. The course closes with a substantial capstone: Decode and annotate a complete endpoint bring-up and DMA transaction trace from link training through completion.

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What you will learn

Leave with a working mental model.

  1. 01 Trace requests and completions through the transaction, data-link, and physical layers
  2. 02 Decode common TLP headers and configuration-space structures
  3. 03 Explain enumeration, BAR sizing, credit flow, and ordering guarantees
  4. 04 Construct protocol traces for normal and error-adjacent cases

Before you begin

Prerequisites

  • Digital systems fundamentals
  • Binary and hexadecimal arithmetic
  • No previous PCIe knowledge required

Curriculum

Course contents

10 modules · 14 lessons

01 Module 1: What PCIe Is and Why It Exists 1 lesson
  1. 01 PCIe Overview and Architecture Preview
02 Module 2: The Physical Layer: Signals and Links 2 lessons
  1. 01 PCIe Physical Layer Preview
  2. 02 PCIe Generations — Gen1 through Gen6
03 Module 3: TLP Basics: How Data Moves 2 lessons
  1. 01 PCIe Transaction Layer
  2. 02 TLP Structure — Header Field Reference
04 Module 4: Configuration Space and Device Identity 2 lessons
  1. 01 PCIe Configuration Space
  2. 02 PCIe BAR Sizing and Mapping
05 Module 5: How PCIe Enumerates Devices 1 lesson
  1. 01 PCIe Enumeration
06 Module 6: The Data Link Layer: Reliability 1 lesson
  1. 01 PCIe Data Link Layer
07 Module 7: Flow Control: Preventing Overflow 1 lesson
  1. 01 PCIe Flow Control
08 Module 8: Ordering Rules: Who Passes Whom 1 lesson
  1. 01 PCIe Ordering Rules
09 Module 9: Completions: Finishing What Was Started 1 lesson
  1. 01 PCIe Completions
10 Module 10: Capstone Studio 2 lessons
  1. 01 Capstone Brief and Architecture
  2. 02 Validation, Review, and Definition of Done