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  • DP83822 Troubleshooting Guide

    • SNLA437 December   2023 DP83822H , DP83822HF , DP83822I , DP83822IF , DP83826I

       

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  • DP83822 Troubleshooting Guide
  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1DP83822 Application Overview
  5. 2Troubleshooting the PHY Application
    1. 2.1  Schematic and Layout Checklist
    2. 2.2  Verify Successful Power-up of PHY
    3. 2.3  Read and Check Register Values
    4. 2.4  Peripheral Pin Checks
      1. 2.4.1 Probe the RESET_N Signal
      2. 2.4.2 Probe the RBIAS pin
      3. 2.4.3 Probe the Serial Management Interface (MDC, MDIO) Signals
      4. 2.4.4 Probe the MDI Signals
    5. 2.5  Verifying Strap Configurations During Initialization
    6. 2.6  Debugging Link Quality
    7. 2.7  Built-In Self Test With Various Loopback Modes
    8. 2.8  Debug the Fiber Connection
    9. 2.9  Debug the MAC Interface
    10. 2.10 Debug the Start of Frame Detect
    11. 2.11 Tools and References
      1. 2.11.1 DP83822 Register Access
      2. 2.11.2 Extended Register Access
      3. 2.11.3 Software and Driver Debug on Linux
        1. 2.11.3.1 Common Terminal Outputs and Solutions
  6. 3References
  7. IMPORTANT NOTICE
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Application Note

DP83822 Troubleshooting Guide

Abstract

This application note provides a suggested flow for evaluating a new application and confirming the expected functionality. The step-by-step recommendations will help ease board bring up and initial evaluation of DP83822 designs.

Trademarks

All trademarks are the property of their respective owners.

1 DP83822 Application Overview

Designed for harsh industrial environments, the DP83822 is an ultra-robust, low-power single-port 10/100 Mbps Ethernet PHY. The DP83822 provides all physical layer functions needed to transmit and receive data over standard twisted-pair cables, or connect to an external fiber optic transceiver. Additionally, the DP83822 provides flexibility to connect to a MAC through a standard MII, RMII, or RGMII interface.

Figure 1-1 is a high-level system block diagram of a typical DP83822 application.

GUID-B821D534-94EA-4036-87F7-D02A928C72BF-low.gif Figure 1-1 DP83822 Block Diagram

The DP83822 connects to an Ethernet MAC and to the MDI. The connection to the MDI is via a transformer and a connector (for copper applications) or capacitors and a transceiver (for fiber applications).

 
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