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Course contents

  • How to Use This Course
  • Protocol Metrics Reference
  • Protocols Glossary
  • Reading Path
  • Protocol Fundamentals25
  • AMBA Family (APB / AHB / AXI)17
  • Coherence Fabrics (ACE / CHI)17
  • Memory Interfaces (DDR / LPDDR / HBM)17
  • PCIe & CXL17
  • Embedded Peripherals (I2C / SPI / UART)17
  • High-Speed I/O (USB / Ethernet / MIPI)17
  • Protocol Verification & Compliance21
  • Protocols Interview Prep5
    • Protocols Whiteboard Framework
    • Scenario: AXI Ordering Trap
    • Scenario: DDR Bandwidth Collapse
    • Scenario: PCIe Link Degrade
    • Protocols Interview Q&A Bank
  • Interface Protocols Cheatsheet
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←Protocols Interview Prep
  1. Topics
  2. Bus Protocols
  3. Protocols Interview Prep
  4. Scenario: AXI Ordering Trap
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    Interface ProtocolsAll levels

    Scenario: AXI Ordering Trap

    A DMA engine passes single-ID tests but fails when traffic uses multiple IDs and a width converter sits between the master and interconnect.

    Scenario

    A DMA engine passes single-ID tests but fails when traffic uses multiple IDs and a width converter sits between the master and interconnect.

    Metric

    random data corruption after enabling multiple outstanding IDs

    Common pitfalls

    • Assume AXI preserves all order

    • Ignore bridge ID remap

    • Debug only data channel

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    Next: Scenario: DDR Bandwidth Collapse

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    See also

    • Scenario: PCIe Link Degrade
    • Protocols Interview Q&A Bank