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1. Agilex™ 5 LVDS SERDES Overview
2. Agilex™ 5 LVDS SERDES Architecture
3. Agilex™ 5 LVDS SERDES Transmitter
4. Agilex™ 5 LVDS SERDES Receiver
5. Agilex™ 5 High-Speed LVDS I/O Implementation Guide
6. Agilex™ 5 LVDS SERDES Timing
7. LVDS SERDES Intel® FPGA IP Design Examples
8. Agilex™ 5 LVDS SERDES Design Guidelines
9. Agilex™ 5 LVDS SERDES Troubleshooting Guidelines
10. LVDS SERDES User Guide: Agilex™ 5 FPGAs and SoCs Archives
11. Document Revision History for the LVDS SERDES User Guide: Agilex™ 5 FPGAs and SoCs
8.1. Use PLLs in Integer PLL Mode for LVDS SERDES
8.2. Use High-Speed Clock from PLL to Clock SERDES Only
8.3. Pin Placement for Differential Channels
8.4. SERDES Pin Pairs for Soft-CDR Mode
8.5. Placing LVDS SERDES Transmitters and Receivers with External PLL
8.6. Sharing LVDS SERDES I/O Lane with Other Intel® FPGA IPs
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5.2. LVDS Interface with External PLL Mode
The LVDS SERDES IP parameter editor provides an option to implement the LVDS interface with the Use External PLL option. With this option turned on you can control the PLL settings, such as dynamically reconfiguring the PLL to support different data rates, dynamic phase shift, and other settings.
If you enable the Use External PLL option with the LVDS SERDES IP core transmitter and receiver, the following signals are required from the IOPLL Intel® FPGA IP:
- Serial clock (fast clock) input to the SERDES of the LVDS SERDES IP transmitter and receiver
- Parallel clock (core clock) used to clock the transmitter FPGA fabric logic and parallel clock used for the receiver
- Asynchronous PLL reset port of the LVDS SERDES IP receiver
- PLL VCO signal for the transmitter and DPA receiver modes of the LVDS SERDES IP
The Clock Resource Summary tab in the LVDS SERDES IP parameter editor provides the details for the signals in the preceding list.
You must instantiate an IOPLL IP to generate the various clocks and load enable signals. Configure these settings in the IOPLL IP parameter editor:
- In the Settings tab, specify the LVDS External PLL settings.
- In the PLL tab:
- Set the Output Clocks settings.
- Select the Compensation Mode according to the following table.
LVDS Functional Mode | IOPLL IP Compensation Mode |
---|---|
TX (without RX non-DPA), RX DPA, RX Soft-CDR | direct |
RX non-DPA (with or without TX) | lvds |