SLVSM71 November   2026 DP83C8512

ADVANCE INFORMATION  

  1.   1
  2. 1 Features
  3. 2 Applications
  4. 3 Description
  5. 4 DP83C8512x Device Comparison
  6. 5 Pin Configuration and Function
    1. 5.1 Pin Configuration and Functions (DP83C8512xM)
    2. 5.2 Pin Configuration and Functions (DP83C8512xRL)
    3. 5.3 Pin Configuration and Functions (DP83C8512xRF)
  7. 6 Specifications
    1. 6.1 Thermal Information
  8. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1  Auto-Negotiation (Speed/Duplex Selection)
      2. 7.3.2  Auto-MDIX Resolution
      3. 7.3.3  Energy Efficient Ethernet
        1. 7.3.3.1 EEE Overview
        2. 7.3.3.2 EEE Negotiation
      4. 7.3.4  EEE for Legacy MACs Not Supporting 802.3az
      5. 7.3.5  Wake-on-LAN Packet Detection
        1. 7.3.5.1 Magic Packet Structure
        2. 7.3.5.2 Magic Packet Example
        3. 7.3.5.3 Wake-on-LAN Configuration and Status
      6. 7.3.6  Low-Power Modes
        1. 7.3.6.1 Active Sleep
        2. 7.3.6.2 IEEE Power-Down
        3. 7.3.6.3 Deep Power Down State
      7. 7.3.7  Clock Output
      8. 7.3.8  Media Independent Interface (MII)
      9. 7.3.9  Reduced Media Independent Interface (RMII)
      10. 7.3.10 RMII Repeater Mode
      11. 7.3.11 Serial Management Interface
        1. 7.3.11.1 Extended Register Space Access
        2. 7.3.11.2 Write Address Operation
        3. 7.3.11.3 Read Address Operation
        4. 7.3.11.4 Write (No Post Increment) Operation
        5. 7.3.11.5 Read (No Post Increment) Operation
        6. 7.3.11.6 Example Write Operation (No Post Increment)
      12. 7.3.12 100BASE-TX
        1. 7.3.12.1 100BASE-TX Transmitter
          1. 7.3.12.1.1 Code-Group Encoding and Injection
          2. 7.3.12.1.2 Scrambler
          3. 7.3.12.1.3 NRZ to NRZI Encoder
          4. 7.3.12.1.4 Binary to MLT-3 Converter
        2. 7.3.12.2 100BASE-TX Receiver
      13. 7.3.13 10BASE-Te
        1. 7.3.13.1 Squelch
        2. 7.3.13.2 Normal Link Pulse Detection and Generation
        3. 7.3.13.3 Jabber
        4. 7.3.13.4 Active Link Polarity Detection and Correction
      14. 7.3.14 Loopback Modes
        1. 7.3.14.1 Near-end Loopback
        2. 7.3.14.2 MII Loopback
        3. 7.3.14.3 PCS Loopback
        4. 7.3.14.4 Digital Loopback
        5. 7.3.14.5 Analog Loopback
        6. 7.3.14.6 Far-End (Reverse) Loopback
      15. 7.3.15 BIST Configurations
      16. 7.3.16 LED and GPIO Configuration
    4. 7.4 DP83C8512x Configuration
      1. 7.4.1 Hardware Bootstraps Configuration
        1. 7.4.1.1 DP83C8512x Hardware Configurations
  9. 8 DP83C8512x Registers
    1. 8.1 DP83C8512Fx Registers
  10. 9 Application and Implementation
    1. 9.1 Application Information
    2. 9.2 Typical Applications
      1. 9.2.1 Twisted-Pair Interface (TPI) Network Circuit
      2. 9.2.2 Transformer Recommendations
      3. 9.2.3 Capacitive DC Blocking
      4. 9.2.4 Design Requirements
        1. 9.2.4.1 Clock Requirements
          1. 9.2.4.1.1 Oscillator
          2. 9.2.4.1.2 Crystal
      5. 9.2.5 Detailed Design Procedure
        1. 9.2.5.1 MII Layout Guidelines
        2. 9.2.5.2 RMII Layout Guidelines
        3. 9.2.5.3 MDI Layout Guidelines
    3. 9.3 Power Supply Recommendations
    4. 9.4 Layout
      1. 9.4.1 Layout Guidelines
        1. 9.4.1.1 Signal Traces
        2. 9.4.1.2 Return Path
        3. 9.4.1.3 Transformer Layout
        4. 9.4.1.4 Metal Pour
        5. 9.4.1.5 PCB Layer Stacking
          1. 9.4.1.5.1 Layout Example
  11. 10Device and Documentation Support
    1. 10.1 Related Documentation
    2. 10.2 Receiving Notification of Documentation Updates
    3. 10.3 Support Resources
    4. 10.4 Trademarks
    5. 10.5 Electrostatic Discharge Caution
    6. 10.6 Glossary
  12. 11Revision History
  13. 12Mechanical, Packaging, and Orderable Information

Package Options

Refer to the PDF data sheet for device specific package drawings

Mechanical Data (Package|Pins)
  • RHB|32
Thermal pad, mechanical data (Package|Pins)
Orderable Information

7.3.2 Auto-MDIX Resolution

The DP83C8512x can determine if a “straight” or “crossover” cable is used to connect to the link partner. The DP83C8512x can automatically re-assign to Td (MDI) channel and Rd (MDIX) channel to establish link with the link partner. Auto-MDIX resolution precedes the actual Auto-Negotiation process that involves exchange of FLPs to advertise capabilities. Automatic MDI/MDIX is described in IEEE 802.3 Clause 40, section 40.8.2 and is not a required implementation for 10BASE-Te and 100BASE-TX. Auto-MDIX can also be used when operating the PHY in Force Mode.

Auto-MDIX is enabled by default in hardware and can be disabled by register configuration, using bit[15] of the PHY Control Register (PHYCR, address 0x0019). When Auto-MDIX is disabled, the PMA is forced to either MDI (“straight”) or MDIX (“crossover”). Manual configuration of MDI or MDIX is accomplished using register configuration, using bit[14] of the PHYCR register.