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

2.6.2 SMI Access Available

At TD (relative to T1), the PHY is able to be accessible via Station Management Tool (SMI) access. MDC and MDIO are used for this communication.

811

720

812
TD (µs)

2.5

1000

1000
Figure 2-7 SMI Timing