SNLA404 December   2022 DP83TC811R-Q1 , DP83TC811S-Q1 , DP83TC812R-Q1 , DP83TC812S-Q1 , DP83TG720R-Q1 , DP83TG720S-Q1

 

  1.   Abstract
  2.   Trademarks
  3. 1Introduction
  4. 2PHY Link-up Sequence
    1. 2.1 Microcontroller Initialization
    2. 2.2 Power-up Sequence
      1. 2.2.1 All Supplies Ramped
      2. 2.2.2 PHY Clock Required Good
      3. 2.2.3 SMI Access Available
      4. 2.2.4 PHY Bootstraps Sampled
    3. 2.3 Check Device ID
    4. 2.4 PHY Initialization
      1. 2.4.1 Managed or Autonomous Mode?
      2. 2.4.2 Program PHY Configuration Settings, Enable Link Start-up
      3. 2.4.3 Program PHY Into Autonomous Mode
      4. 2.4.4 Soft Restart or Polling for Link
      5. 2.4.5 Results of Link Polling
    5. 2.5 Post Start-up Operation
    6. 2.6 Reset Sequence
      1. 2.6.1 Reset Initiated
      2. 2.6.2 SMI Access Available
      3. 2.6.3 Transition to Normal Operation
  5. 3Summary
  6.   A Appendix

2.4 PHY Initialization

At this point, the PHY has been powered up and functions properly. The next step is to load any needed application-specific initial configurations of the PHY. Examples of how to initialize TI’s automotive PHYs are found in the sections on software configuration in the DP83TG720: Configuring for Open Alliance Specification Compliance, DP83TC812, DP83TC813, and DP83TC814: Configuring for Open Alliance Specification Compliance, and DP83TC811: Configuring for Open Alliance Specification Compliance. See the flowchart in Figure 2-5 for the proper method to initialize a PHY.

Figure 2-5 PHY Initialization Flowchart