AN 888: PHY Lite for Parallel Interfaces Reference Design with Dynamic Reconfiguration for Intel® Stratix® 10 Devices

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ID 683220
Date 9/11/2020
Public
Document Table of Contents
Document Table of Contents x
1. PHY Lite for Parallel Interfaces Reference Design with Dynamic Reconfiguration for Intel® Stratix® 10 Devices
1. PHY Lite for Parallel Interfaces Reference Design with Dynamic Reconfiguration for Intel® Stratix® 10 Devices x
1.1. Features 1.2. Hardware and Software Requirements 1.3. Design System Architecture Overview 1.4. Dynamic Reconfiguration Overview 1.5. PHY Lite Per-Bit Overview 1.6. Compiling the Reference Design 1.7. Hardware Testing 1.8. Document Revision History for AN 888: PHY Lite for Parallel Interfaces Reference Design with Dynamic Reconfiguration for Intel® Stratix® 10 Devices 1.9. Appendix A: HiLo Loopback Card Pin Connections 1.10. Appendix B: Retrieving Lane and Pin Information 1.11. Appendix C: Decoding Parameter Table
1.3. Design System Architecture Overview x
1.3.1. Functional Description
1.3.1. Functional Description x
1.3.1.1. DUT_MODULE 1.3.1.2. Traffic Generator/Checker Module 1.3.1.3. DYN_CFG Controller 1.3.1.4. Clocking Scheme
1.4. Dynamic Reconfiguration Overview x
1.4.1. Register Address Map 1.4.2. Dynamic Reconfiguration API Functions
1.5. PHY Lite Per-Bit Overview x
1.5.1. Per-Bit Deskew Concept 1.5.2. Read Deskew Algorithm
1.7. Hardware Testing x
1.7.1. Setting Up the Development Kit 1.7.2. Generating Executable and Linking Format (.elf) Programming File 1.7.3. Running the Hardware Reference Design 1.7.4. Results
1.7.4. Results x
1.7.4.1. Dynamic Calibration Result 1.7.4.2. Random Data Transfer Result
1. PHY Lite for Parallel Interfaces Reference Design with Dynamic Reconfiguration for Intel® Stratix® 10 Devices

1.5.1. Per-Bit Deskew Concept

In real-life cases, the time DQ signal reaches the receiving side varies, depending on board skew, trace length mismatch, unit variation, and so on. All these factors may result a narrower DQ window than expected, as shown in the following figure:
Figure 5. Passing Window Result Before Per-Bit DeskewThis figure shows data are skewed due to board trace different and other factors, resulting a smaller passing window.

To overcome this, the PHY Lite for Parallel Interfaces IP core has the capability to calibrate each DQ/DQS pin separately. Successful per-bit calibration may improve the total DQS opening window. An example of the per-bit calibration (happening on the RX side) is shown in the following figures:

Figure 6. First DQ_0 Calibrated
Figure 7. Second DQ_1 Calibrated
Figure 8. Comparison of Passing Window Result Before and After Per-Bit Deskew
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