SNLU324 March   2023

 

  1.   Abstract
  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 External 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 DS560DF410EVM 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 DS560DF410EVM 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. 3Related Documentation
    1. 3.1 Supplemental Content
  6. 4EVM Cable Assemblies

Abstract

The DS560DF410 evaluation module (EVM) allows the user to quickly evaluate both the high-speed and low-speed functionality of the DS560DF410 retimer. The DS560DF410 is a 4-channel multi-rate retimer with integrated signal conditioning. The device supports retimed operation for PAM4 and NRZ data rates from 19.6 to 28.9 GBd. Integrated physical AC coupling capacitors (both TX and RX) eliminate the need for external capacitors on the PCB. The DS560DF410 relies on two power supply voltages, 1.2 V and 1.8 V, managed on the EVM through an onboard power tree.

The advanced equalization features of the DS560DF410 include a low-jitter 4-tap transmit finite impulse response (FIR) filter, as well as receive adaptive continuous-time linear equalizer (CTLE), decision feedback equalizer (DFE), and feed forward equalizer (FFE). This comprehensive equalization enables reach extension for lossy interconnects and backplanes with multiple connectors as well as crosstalk. The integrated CDR function is designed for front-port optical module applications to reset the jitter budget and retime the high-speed serial data. The DS560DF410 implements a 2 × 2 cross-point on each channel pair, providing the host with both lanes crossing and fanout options.

The DS560DF410 can be configured through the default I2C two-wire serial target mode, or the device can configure itself from an external EEPROM by operating in controller mode. On-chip eye monitor and PRBS generator and checker functions allow for comprehensive in-system diagnostics.