SNLU313 August   2022 DP83TG720R-Q1 , DP83TG720S-Q1

 

  1.   Abstract
  2.   Trademarks
  3. 1Getting Started
  4. 2HyperLynx
    1. 2.1 Transient Simulations of RGMII
      1. 2.1.1 Setup
      2. 2.1.2 Measurements
      3. 2.1.3 Further Configuration
    2. 2.2 SGMII Differential Simulation
  5. 3Keysight ADS
    1. 3.1 Transient Simulations of RGMII
      1. 3.1.1 Setup
      2. 3.1.2 Simulation
      3. 3.1.3 Further Configuration
    2. 3.2 SGMII Channel Simulation with Eye Diagram

2.2 SGMII Differential Simulation

This example will show how to simulate the SGMII differential interface. Most of the configuration will be the same as the above example, so refer to the previous section for more detailed direction.

  1. Create a schematic in this fashion, using an S4P model of a differential FR4 trace for the transmission line.

     

    GUID-20220607-SS0I-ZCPZ-PHLM-MJGV9BWL2L2R-low.png
  2. Double click U1 and U2 and select the dp83tg720s.ibs model.
  3. Open the Manage model selector window for U1. Notice pins 23 and 24 have the ibis_sgmii_tx model selected, and are notated as a diff twin pair.
  4. Create a 625MHz PRBS-9 stimuli for the SGMII pins and assign them to pins 23 and 24.
  5. Open the simulation window and select the box next to pin 32. The Blue and Green traces show the individual trace waveforms, while the red shows math (pin 32 – pin 33). GUID-20220607-SS0I-PBKQ-JC6N-5HH0XHHBLM9B-low.png

     

  6. Take measurements and change the configuration as desired.