LVDS Tunneling Protocol and Interface (LTPI) IP User Guide: Agilex™ 3 and Agilex™ 5 FPGAs and SoCs
ID
844310
Date
8/15/2025
Public
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: Agilex™ 3 and Agilex™ 5 FPGAs and SoCs
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
1.4.4.3. Link Speed Frame
The link speed frame is used to select the desired operating speed.
Frame Offset (bytes) |
Size (bits) |
Bit Field | Description | |||||||
---|---|---|---|---|---|---|---|---|---|---|
7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 | |||
0 | 8 | Comma Symbol | Comma symbol as defined in the Frame Type and Frame Subtype table. | |||||||
1 | 8 | Frame Subtype | Frame subtype as defined in the Frame Type and Frame Subtype table. | |||||||
2 | 8 | LTPI Version Major | LTPI Version Minor | BCD Encoded LTPI Version (Major and minor LTPI version numbers). | ||||||
3 | 8 | Speed Select | Speed select as defined in the Speed Capabilities Encoding table. | |||||||
4 | 8 | Reserved | Reserved | |||||||
5 | 8 | Reserved | Reserved | |||||||
6 | 8 | Reserved | Reserved | |||||||
7 | 8 | Reserved | Reserved | |||||||
8 | 8 | Reserved | Reserved | |||||||
9 | 8 | Reserved | Reserved | |||||||
10 | 8 | Reserved | Reserved | |||||||
11 | 8 | Reserved | Reserved | |||||||
12 | 8 | Reserved | Reserved | |||||||
13 | 8 | Reserved | Reserved | |||||||
14 | 8 | Reserved | Reserved | |||||||
15 | 8 | CRC | CRC8 checksum |