SNLA434 November   2023 DP83TC812R-Q1 , DP83TD510E , DP83TG720R-Q1 , LMK1C1103 , LMK1C1104 , LMK5B12204 , LMK6C

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Introduction
  5. 2Power Supply
    1. 2.1 Internal Supply Rails
    2. 2.2 External Supply Lines
    3. 2.3 Requirements for PoDL
    4. 2.4 Clocking
      1. 2.4.1 Topology 1
      2. 2.4.2 Topology 2
  6. 3Summary
  7. 4References

2.4 Clocking

Clocking the different components of the interface system needs to be considered, for investigation communication system is built around processor with a MAC layer and a PHY layer, each part is an individual hardware and needs to be provided with an external crystal or oscillator. This leads to the typical use of either of the following two options.

GUID-20231108-SS0I-HTTJ-FHNS-X6GLNG22R18D-low.svgFigure 2-11 Topology 1
GUID-20231108-SS0I-6FKD-0372-27382LSLCKBG-low.svgFigure 2-12 Topology 2

Pending the chosen topology, there is an importance to consider how to implement those to be robust for EMC and radiate less EMI.