SNLU293A December   2022  – December 2022 DS560DF810

 

  1.   DS560DF810EVM User's Guide
  2.   Trademarks
  3. 1Hardware Description and Setup
    1. 1.1 Required Hardware
    2. 1.2 General Hardware Test Setup Procedure
    3. 1.3 Hardware Configuration to use Onboard 25 MHz Oscillator for CAL_CLK_IN
  4. 2Software Description
    1. 2.1 Software Installation Sequence
    2. 2.2 Latte Functional Overview
    3. 2.3 Useful Latte Short-Cuts
    4. 2.4 DS560DF810EVM Initialization Through the Latte GUI
      1. 2.4.1 Connect Latte to Board
      2. 2.4.2 Compile Libraries
      3. 2.4.3 Example: Programming DS560DF810EVM for 26.5625 GBd PAM4 Test Case
      4. 2.4.4 Retimer Configuration
      5. 2.4.5 Retimer “Useful Functions” (Contained in the usefulFunctions.py Latte Script)
      6. 2.4.6 Vertical Eye Monitor
  5. 3Test Case Examples
    1. 3.1 Transmitter Test Case – EVM Board Output Evaluation for 26.5625 GBd PAM4 Data
    2. 3.2 Receiver Test Case – High Loss Input Channel to Retimer EVM, 26.5625 GBd PAM4
  6. 4Supplemental Documents
  7. 5EVM Cable Assemblies
  8. 6Revision History

3.1 Transmitter Test Case – EVM Board Output Evaluation for 26.5625 GBd PAM4 Data

The following is an example retimer Tx test case with results collected using this EVM. This basic test setup involves measurement of the retimer output straight out of the EVM. The retimer Tx output channel is comprised of the EVM board trace plus the MXP connector and cable.

  • Data Rate: 26.5625 GBd PAM4

  • Data pattern: PRBS15

  • Total EVM output channel insertion loss: −2.6 dB at 13.28 GHz

  • Retimer Tx settings: swing=0, post1=-5, pre1=-3

    • These Tx settings correspond to VOD=1 Vpp, pre1 around −2 dB and post1 around −3 dB.

Figure 3-1 Retimer Output Eye Diagram for Transmitter Test Case; No Reference CTLE Applied on the Keysight DCA-X
Table 3-1 Keysight DCA-X Jitter Mode Results

Measurement

Eye 0/1

Eye 1/2

Eye 2/3

Eye Width (1E-6)

346 mUI

399 mUI

318 mUI

Eye Height (1E-6)

115.8 mV

108.8 mV

118.0 mV