AN 875: Intel® Stratix® 10 E-Tile PCB Design Guidelines

Download PDF
ID 683262
Date 3/12/2019
Public
Document Table of Contents
Document Table of Contents x
1. Introduction 2. Platform Design Strategy for 56G PAM4 Channels 3. Document Revision History for AN 875: Intel® Stratix® 10 E-Tile PCB Design Guidelines
2. Platform Design Strategy for 56G PAM4 Channels x
2.1. Intel® Stratix® 10 E-Tile Transceiver Channel Usage Mode 2.2. Intel® Stratix® 10 E-Tile Signaling - PAM4 vs. NRZ (PAM2) 2.3. PCB Design Flow
2.3. PCB Design Flow x
2.3.1. Design Target at 56 Gbps PAM4 Standard 2.3.2. PCB Materials and Stackup Design 2.3.3. FPGA PCB Design 2.3.4. PCB Pre-Layout Simulation Phase 2.3.5. PCB Post-Layout Simulation Phase
2.3.2. PCB Materials and Stackup Design x
2.3.2.1. Insertion Loss 2.3.2.2. Return Loss 2.3.2.3. Package Loss and Crosstalk 2.3.2.4. PCB Via Design 2.3.2.5. PCB Connector 2.3.2.6. Cable Usage in PCB Design
2.3.3. FPGA PCB Design x
2.3.3.1. FPGA PCB Breakout Design and Reference 2.3.3.2. P/N De-skew Strategy on Differential Pairs 2.3.3.3. Crosstalk - NEXT and FEXT in Differential Pairs
1. Introduction
2. Platform Design Strategy for 56G PAM4 Channels
3. Document Revision History for AN 875: Intel® Stratix® 10 E-Tile PCB Design Guidelines

2.3.2. PCB Materials and Stackup Design

The proper selection of PCB materials and stackup is an essential key in the design flow. There are four key PCB channel design parameters/elements for E-Tile:
  • Insertion Loss (IL)
    • The higher the channel loss, the more difficult it is for devices to send high-speed data over the channel reliably.
    • Different standards have different recommended channel losses.
  • Return Loss (RL)
    • Return Loss (RL) measures how much energy a given channel reflects back. A channel with a high impedance discontinuity will have a bad RL performance (i.e. it will reflect back a lot of energy).
  • Far-End and Near-End Crosstalk (FEXT and NEXT)
    • Crosstalk can be considered a form of noise from neighboring channels. It reduces the noise margin.
  • Mode Conversion (MC)
    • Mode conversion can reduce the common noise cancellation. Common mode noise can leak into the differential mode and reduce the noise margin.
Level Two Title