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

2.3.2.6. Cable Usage in PCB Design

The direct attached copper cable (DAC) is the most common cable usage in high-speed PCB link design. DAC is available in various cable lengths/sizes for different applications.

You must make sure the cable model boundary is clearly defined at both ends. In addition, you should check with the cable vendor if the cable model includes the cable wire termination and edge card (elements to consider in simulation).

A ~5 dB (at 14 GHz) host board, with most AWG-26 2 m, 3 m cables and 5 m cables and with careful transmit and receive equalization tuning, can support 56G PAM4. The E-tile PAM4 mode can support ~30 dB pad-to-pad loss in cable applications.

Figure 13. TX-RX Connection via Cable
Figure 14. Channel Eye Simulation of Different Cables (~5 dB RX and 5 dB TX PCB Trace Routing)
Level Two Title