Agilex™ 7 LVDS SERDES User Guide: F-Series and I-Series

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ID 721819
Date 9/05/2024
Public
Document Table of Contents
Document Table of Contents x
1. Agilex™ 7 F-Series and I-Series LVDS SERDES Overview 2. Agilex™ 7 F-Series and I-Series LVDS SERDES Architecture 3. Agilex™ 7 F-Series and I-Series LVDS SERDES Transmitter 4. Agilex™ 7 F-Series and I-Series LVDS SERDES Receiver 5. Agilex™ 7 F-Series and I-Series High-Speed LVDS I/O Implementation Guide 6. Agilex™ 7 F-Series and I-Series LVDS SERDES Timing 7. LVDS SERDES Intel® FPGA IP Design Examples 8. Agilex™ 7 F-Series and I-Series LVDS SERDES Design Guidelines 9. Agilex™ 7 F-Series and I-Series LVDS SERDES Troubleshooting Guidelines 10. Documentation Related to the Agilex™ 7 LVDS SERDES User Guide: F-Series and I-Series 11. Document Revision History for the Agilex™ 7 LVDS SERDES User Guide: F-Series and I-Series
1. Agilex™ 7 F-Series and I-Series LVDS SERDES Overview x
1.1. LVDS SERDES Usage Modes
2. Agilex™ 7 F-Series and I-Series LVDS SERDES Architecture x
2.1. F-Series and I-Series GPIO Banks, SERDES, and DPA Locations 2.2. SERDES Blocks, Modes, and Clock Domains
3. Agilex™ 7 F-Series and I-Series LVDS SERDES Transmitter x
3.1. LVDS SERDES Transmitter Blocks 3.2. Serializer 3.3. Differential I/O Bit Position 3.4. Clocking the Differential Transmitters
3.2. Serializer x
3.2.1. Serializer Bypass for DDR and SDR Operations
3.4. Clocking the Differential Transmitters x
3.4.1. Transmitter Output Clock Parameters Settings
3.4.1. Transmitter Output Clock Parameters Settings x
3.4.1.1. Edge-Aligned tx_outclock to tx_out 3.4.1.2. Center-Aligned tx_outclock to tx_out
4. Agilex™ 7 F-Series and I-Series LVDS SERDES Receiver x
4.1. LVDS SERDES Receiver Blocks 4.2. Clocking the LVDS SERDES Receivers 4.3. LVDS SERDES Receiver Modes
4.1. LVDS SERDES Receiver Blocks x
4.1.1. Dynamic Phase Alignment Block 4.1.2. Synchronizer (DPA FIFO) 4.1.3. Data Realignment Block (Bit Slip) 4.1.4. Deserializer
4.2. Clocking the LVDS SERDES Receivers x
4.2.1. Receiver Input Clock Parameters Settings
4.2.1. Receiver Input Clock Parameters Settings x
4.2.1.1. Edge-Aligned inclock to rx_in 4.2.1.2. Center-Aligned inclock to rx_in
4.3. LVDS SERDES Receiver Modes x
4.3.1. Non-DPA Mode 4.3.2. DPA Mode 4.3.3. Soft-CDR Mode
5. Agilex™ 7 F-Series and I-Series High-Speed LVDS I/O Implementation Guide x
5.1. LVDS SERDES Intel® FPGA IP 5.2. LVDS Interface with External PLL Mode 5.3. LVDS SERDES IP Initialization and Reset
5.1. LVDS SERDES Intel® FPGA IP x
5.1.1. Release Information 5.1.2. LVDS SERDES Intel® FPGA IP Features 5.1.3. LVDS SERDES IP Usage Modes 5.1.4. Generating the LVDS SERDES Intel® FPGA IP 5.1.5. LVDS SERDES Intel® FPGA IP Parameter Settings 5.1.6. LVDS SERDES Intel® FPGA IP Signals
5.1.4. Generating the LVDS SERDES Intel® FPGA IP x
5.1.4.1. Intel® FPGA IP Generation Output
5.1.5. LVDS SERDES Intel® FPGA IP Parameter Settings x
5.1.5.1. LVDS SERDES Intel® FPGA IP General Settings 5.1.5.2. LVDS SERDES Intel® FPGA IP PLL Settings 5.1.5.3. LVDS SERDES Intel® FPGA IP Receiver Settings 5.1.5.4. LVDS SERDES Intel® FPGA IP Transmitter Settings 5.1.5.5. LVDS SERDES Intel® FPGA IP Clock Resource Summary
5.2. LVDS Interface with External PLL Mode x
5.2.1. IOPLL IP Signal Interface with LVDS SERDES IP 5.2.2. IOPLL Parameter Values for External PLL Mode 5.2.3. Connection between IOPLL IP and LVDS SERDES IP in External PLL Mode
5.3. LVDS SERDES IP Initialization and Reset x
5.3.1. Initializing the LVDS SERDES IP in Non-DPA Mode 5.3.2. Initializing the LVDS SERDES IP in DPA Mode 5.3.3. Resetting the DPA 5.3.4. Word Boundaries Alignment
5.3.4. Word Boundaries Alignment x
5.3.4.1. Aligning Word Boundaries
6. Agilex™ 7 F-Series and I-Series LVDS SERDES Timing x
6.1. LVDS SERDES Intel® FPGA IP Timing 6.2. LVDS SERDES Source-Synchronous Timing Budget
6.1. LVDS SERDES Intel® FPGA IP Timing x
6.1.1. I/O Timing Analysis 6.1.2. FPGA Timing Analysis 6.1.3. Timing Analysis for the External PLL Mode
6.1.1. I/O Timing Analysis x
6.1.1.1. Obtaining RSKM Report 6.1.1.2. Obtaining TCCS Report
6.2. LVDS SERDES Source-Synchronous Timing Budget x
6.2.1. Transmitter Channel-to-Channel Skew 6.2.2. Receiver Skew Margin
7. LVDS SERDES Intel® FPGA IP Design Examples x
7.1. LVDS SERDES IP Synthesizable Quartus® Prime Design Examples 7.2. LVDS SERDES IP Simulation Design Example
8. Agilex™ 7 F-Series and I-Series LVDS SERDES Design Guidelines x
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 in the Same GPIO Bank
1. Agilex™ 7 F-Series and I-Series LVDS SERDES Overview
2. Agilex™ 7 F-Series and I-Series LVDS SERDES Architecture
3. Agilex™ 7 F-Series and I-Series LVDS SERDES Transmitter
4. Agilex™ 7 F-Series and I-Series LVDS SERDES Receiver
5. Agilex™ 7 F-Series and I-Series High-Speed LVDS I/O Implementation Guide
6. Agilex™ 7 F-Series and I-Series LVDS SERDES Timing
7. LVDS SERDES Intel® FPGA IP Design Examples
8. Agilex™ 7 F-Series and I-Series LVDS SERDES Design Guidelines
9. Agilex™ 7 F-Series and I-Series LVDS SERDES Troubleshooting Guidelines
10. Documentation Related to the Agilex™ 7 LVDS SERDES User Guide: F-Series and I-Series
11. Document Revision History for the Agilex™ 7 LVDS SERDES User Guide: F-Series and I-Series

4.3.3. Soft-CDR Mode

The F-Series and I-Series SERDES channel offers the soft-CDR mode to support the GbE and SGMII protocols. A receiver PLL uses the local clock source for reference.
Figure 21. Receiver Data Path Block Diagram—Soft-CDR Mode


In the soft-CDR mode, the synchronizer block is inactive. The DPA circuitry selects an optimal DPA clock phase to sample the data. The receiver uses the selected clock for bit slip operation and deserialization.

Additionally, the DPA block divides the selected DPA clock by the deserialization factor and forwards it as rx_divfwdclk together with the deserialized data to the FPGA fabric. The rx_divfwdclk clock signal resides in the periphery clock (PCLK) network.

If you use the soft-CDR mode, do not assert the rx_dpa_reset signal after the DPA has been trained. The DPA continuously chooses new phase taps from the PLL to track parts per million (PPM) differences between the reference clock and incoming data.

In the soft-CDR mode, the rx_dpa_locked signal is invalid because the DPA continuously changes its phase to track PPM differences between the upstream transmitter and the local receiver input reference clocks. However, you can use the rx_dpa_locked signal to determine the initial DPA locking conditions that indicate the DPA has selected the optimal phase tap to capture the data. The rx_dpa_locked signal deasserts when the receiver operates in the soft-CDR mode. The receiver also forwards the rx_divfwclk parallel clock, generated from the DPA clock, to the FPGA fabric.

Note: In the soft-CDR mode, you must place all receiver channels of a SERDES instance in one I/O sub-bank. Refer to the related information for the number of soft-CDR channels supported in each sub-bank. Refer to device pin-out files to identify the locations pin locations that support the soft-CDR mode.
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