LVDS Tunneling Protocol and Interface (LTPI) IP User Guide

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ID 844310
Date 11/25/2025
Public
Document Table of Contents
Document Table of Contents x
1. Overview 2. Configuring and Generating the IP 3. Simulating the IP 4. Validating the IP 5. Troubleshooting and Debugging Issues 6. Appendix A: Functional Description 7. Appendix B: Registers 8. Document Revision History for the LVDS Tunneling Protocol and Interface (LTPI) IP User Guide
1. Overview x
1.1. About the LVDS Tunneling Protocol and Interface (LTPI) IP 1.2. About the Document 1.3. Applicable Applications 1.4. Key Concepts 1.5. IP Design Flow 1.6. Design Considerations/Guidelines
1.1. About the LVDS Tunneling Protocol and Interface (LTPI) IP x
1.1.1. IP Release Information 1.1.2. IP Features 1.1.3. IP High-level Block Diagram 1.1.4. Licensing the IP 1.1.5. Device Family Support 1.1.6. Device Speed Grade Support 1.1.7. IP Core Support Levels 1.1.8. IP Performance and Resource Utilization
1.2. About the Document x
1.2.1. Target Audience 1.2.2. Conventions Used in the Document 1.2.3. Acronyms 1.2.4. Reference Documents and Training
1.4. Key Concepts x
1.4.1. Interface Tunneling Principle 1.4.2. LTPI Tunneling Methodology 1.4.3. Clock Topology 1.4.4. LTPI Frame 1.4.5. System-level Block Diagram 1.4.6. Link Management 1.4.7. Signal Description
1.4.4. LTPI Frame x
1.4.4.1. Link Detect and Link Speed Selection Frames 1.4.4.2. Link Detect Frame 1.4.4.3. Link Speed Frame 1.4.4.4. Advertise, Configure, and Accept Frames 1.4.4.5. Advertise Frames 1.4.4.6. Configure Frame 1.4.4.7. Accept Frame 1.4.4.8. LTPI Operational Frames 1.4.4.9. Default I/O Frame 1.4.4.10. Default Data Frame
1.4.6. Link Management x
1.4.6.1. Link Training 1.4.6.2. Link Configuration 1.4.6.3. Operational Mode
1.4.7. Signal Description x
1.4.7.1. Clock and Power Signals 1.4.7.2. Channel Signals 1.4.7.3. Avalon® Memory-Mapped Primary Interface Signals 1.4.7.4. Avalon® Memory-Mapped Secondary Interface Signals 1.4.7.5. Avalon® Memory-Mapped CSR Interface Signals 1.4.7.6. Miscellaneous Interface Signals
2. Configuring and Generating the IP x
2.1. Configuring the Quartus® Prime Project 2.2. Configuring the LVDS Tunneling Protocol and Interface (LTPI) IP 2.3. Generating HDL for Synthesis and Simulation 2.4. Generating the Simulation Design Example
2.2. Configuring the LVDS Tunneling Protocol and Interface (LTPI) IP x
2.2.1. Configuring the LVDS Tunneling Protocol and Interface (LTPI) IP Parameters
2.3. Generating HDL for Synthesis and Simulation x
2.3.1. Quartus® Prime Pro Edition Generated File Structure 2.3.2. Quartus® Prime Standard Edition Generated File Structure
2.4. Generating the Simulation Design Example x
2.4.1. Generated Directory Structure and Files
3. Simulating the IP x
3.1. Design Example Features 3.2. Design Example Components 3.3. Configuring the Design Example Parameters 3.4. Simulating the Design Example
3.4. Simulating the Design Example x
3.4.1. Simulation Testbench Flow 3.4.2. Simulation Output
4. Validating the IP x
4.1. Validating the IP Using Agilex™ 5 Device
4.1. Validating the IP Using Agilex™ 5 Device x
4.1.1. Compiling the Design Example in Hardware on Agilex™ 5 Device 4.1.2. Validating the Design Example in Hardware on Agilex™ 5 Device
4.1.2. Validating the Design Example in Hardware on Agilex™ 5 Device x
4.1.2.1. Configuring the Clocks in Hardware 4.1.2.2. Programming the FPGA 4.1.2.3. Running the Hardware Test
6. Appendix A: Functional Description x
6.1. GPIO Channel 6.2. I2C Channel 6.3. UART Channel 6.4. Data Channel 6.5. OEM Channel
1. Overview
2. Configuring and Generating the IP
3. Simulating the IP
4. Validating the IP
5. Troubleshooting and Debugging Issues
6. Appendix A: Functional Description
7. Appendix B: Registers
8. Document Revision History for the LVDS Tunneling Protocol and Interface (LTPI) IP User Guide

5. Troubleshooting and Debugging Issues

This section describes debug methods that support debugging your simulation design example. The following troubleshooting table provides additional guidance.
Table 49.  Troubleshooting Steps for Simulation Design Example
Issue Troubleshooting Checklist
LTPI link is not established Follow these troubleshooting steps to resolve the issue:​
  1. Enable Enable Status Interface and Enable Error Interface from the General tab in the IP configuration of your design.​
  2. Monitor the pll_locked signal. Confirm that all specified clock inputs are correct​.
  3. Monitor the link_aligned signal. If this signal is low, it indicates that the HPM and SCM LVDS connection is not properly established.​
  4. Once the link alignment is established, the local_link_state signal should transition through the following states, in the following order:
    1. link_detect
    2. link_speed
    3. advertise
    4. configuration
    5. operational​
  5. Check the similarity of the HPM and SCM capabilities when the design does not proceed from the configuration state to the operational state.
Level Two Title