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

2.4.4 Retimer Configuration

The example in the previous section configures the DS560DF810EVM with the default modes set in Latte. The user may change the mode and channel by modifying the parameters in the “1_bringupParams.py” Latte script.

  • Data rate: Data rate can be configured using system variable channelsDataRate. Reset of the device is recommended with this change

  • Channel selection and initialization: Channels to be initialized can be selected using the system variable channelsEnabled array. Enable a specific retimer channel by setting the bit corresponding to it in the array (where channel order is sequential, from 0 to 7) to “1”

  • PAM4 / NRZ mode: Change the system variable pam4Mode, to switch between PAM4 and NRZ modes. A reset of the device is recommended once the mode is changed

  • PRBS generator / checker polarity: To change the polarity of Tx PRBS generator, use variable txPolarityInv. To change the polarity of Rx PRBS checker, use variable rxPolarityInv

  • PRBS selection: The PRBS pattern may be set through system variables rxPrbsSel and txPrbsSel. Enter the number corresponding to the desired pattern

  • Channel type: The channel type can be selected with system variable channelType. Set this variable to “1” for use with a DAC cable or “0” for default mode