SNLA437 December   2023 DP83822H , DP83822HF , DP83822I , DP83822IF , DP83825I , DP83826E , DP83826I

 

  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

2.11.2 Extended Register Access

To read and write registers in extended register space, see the following procedures:

Write procedure for MMD "1F" registers:

write reg<000D> = 0x001F

write reg<000E> = <address>

write reg<000D> = 0x401F

write reg<000E> = <value>

Read procedure for MMD "1F" registers:

write reg<000D> = 0x001F

write reg<000E> = <address>

write reg<000D> = 0x401F

read reg<000E>

To write a register in the extended register set and automatically increment the address register to the next higher value following the write operation:

Write (Post Increment) procedure for MMD "1F" registers:

write reg<000D> = 0x001F

write reg<000E> = <address>

write reg<000D> = 0x401F

write reg<000E> = 0x0C50

write reg<000E> = <value>

To read a register in the extended register set and automatically increment the address register to the next higher value following the read operation:

Read (Post Increment) procedure for MMD "1F" registers:

write reg<000D> = 0x001F

write reg<000E> = <address>

write reg<000D> = 0x801F

read reg<000E>

read reg<000E>

Note: Above write and read procedure is normally used for registers with address greater than 0x001F, but the procedure can also be used for any address in gernal.