SNLA411 October   2022 DP83TC812R-Q1 , DP83TC812S-Q1 , DP83TC813R-Q1 , DP83TC813S-Q1

 

  1.   Abstract
  2.   Trademarks
  3. 1 Introduction
    1. 1.1 System Block Diagram
    2. 1.2 Terminology
  4. 2 TC10 Pin Descriptions
  5. 3 Primary Functions of the PHY
    1. 3.1 Transition from Sleep to Wake-up mode
      1. 3.1.1 Local Wake Detection
      2. 3.1.2 WUP Transmission and Reception
    2. 3.2 Wake Forwarding
    3. 3.3 Transition to Sleep - Sleep Negotiation
      1. 3.3.1 Sleep Ack
      2. 3.3.2 Sleep Request
      3. 3.3.3 Sleep Silent
      4. 3.3.4 Sleep Fail
      5. 3.3.5 Sleep
      6. 3.3.6 Normal State
      7. 3.3.7 Other Transitions
        1. 3.3.7.1 Forced Sleep
        2. 3.3.7.2 Activity during Sleep Negotiation
        3. 3.3.7.3 Link Down during Sleep Negotiation
        4. 3.3.7.4 Sleep Silent to Standby
  6. 4 Relevant Registers
  7. 5 Power Supply Recommendation
    1. 5.1 Core Supply Network Recommendation
    2. 5.2 Networks with Shared Core Supplies
  8. 6 Sequence of Events and Timing
    1. 6.1 Local Wake Timing
    2. 6.2 Remote Wake Timing
    3. 6.3 Successful Sleep Negotiation Timing
    4. 6.4 Sleep Abort Timing
    5. 6.5 WUR Timing
  9. 7 Ethernet Network Wake-up
  10. 8 Configuration for non-TC10 Applications
  11. 9 Additional Features
    1. 9.1 WUR Initiation Through WAKE Pin
    2. 9.2 Programmable Wake-Forward Pulse Width
  12. 10Conclusion

7 Ethernet Network Wake-up

Wake Forwarding feature in DP83TC812/3 can be leveraged for waking up the whole ethernet network. This section shows a simple ethernet network and timing of the wake-up of all the ethernet PHYs in the network.

Figure 7-1 Simple Ethernet Network

When PHY1 wakes-up locally, it powers up and immediately transmits WUP. PHY21 wakes-up on reception of the WUP and immediately transmits >40μs pulse on the WAKE pin. Since the WAKE of PHY21, PHY22 are connected together, PHY22 wakes up after the reception of the >40μs pulse. PHY22 now wakes-up and then transmits WUP which wakes up PHY3.

The following image and table show the wake timing of this network.

Figure 7-2 Timing - Network Wake

The timing numbers are derived based on assumption that power supplies are enabled immediately after INH is driven high and the total supply ramp time is 5 ms. All the timing numbers in the table are tabulated from start of WAKE on PHY1.

Table 7-1 Timing - Network Wake
Parameter Event Units Min Typ Max
T6.1 WUP on MDI line(1,2) ms 17.04
T6.2 INH high of PHY21 ms 17.74
T6.3 WAKE pulse output from PHY21 ms 18.44
T6.4 INH high of PHY22 ms 18.48
T6.5 WUP on MDI line (2,3) ms 35.48
T6.6 INH high of PHY3 ms 36.18