Stratix® 10 High-Speed LVDS I/O User Guide

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ID 683792
Date 7/08/2024
Public
Document Table of Contents
Document Table of Contents x
1. Stratix® 10 High-Speed LVDS I/O Overview 2. Stratix® 10 High-Speed LVDS I/O Architecture and Features 3. Stratix 10 High-Speed LVDS I/O Design Considerations 4. Stratix® 10 High-Speed LVDS I/O Implementation Guides 5. LVDS SERDES Intel® FPGA IP References 6. Stratix® 10 High-Speed LVDS I/O User Guide Archives 7. Document Revision History for the Stratix® 10 High-Speed LVDS I/O User Guide
1. Stratix® 10 High-Speed LVDS I/O Overview x
1.1. Stratix® 10 LVDS SERDES Usage Modes 1.2. Stratix® 10 LVDS Channels Support 1.3. Stratix® 10 GPIO Banks, SERDES, and DPA Locations
2. Stratix® 10 High-Speed LVDS I/O Architecture and Features x
2.1. Stratix® 10 LVDS SERDES I/O Standards Support 2.2. LVDS Transmitter Programmable I/O Features 2.3. SERDES Circuitry 2.4. Differential Transmitter in Stratix® 10 Devices 2.5. Differential Receiver in Stratix® 10 Devices
2.2. LVDS Transmitter Programmable I/O Features x
2.2.1. Programmable Pre-Emphasis 2.2.2. Programmable Differential Output Voltage
2.4. Differential Transmitter in Stratix® 10 Devices x
2.4.1. Transmitter Blocks in Stratix® 10 Devices 2.4.2. Serializer Bypass for DDR and SDR Operations
2.5. Differential Receiver in Stratix® 10 Devices x
2.5.1. Receiver Blocks in Stratix® 10 Devices 2.5.2. Receiver Modes in Stratix® 10 Devices
2.5.1. Receiver Blocks in Stratix® 10 Devices x
2.5.1.1. DPA Block 2.5.1.2. Synchronizer 2.5.1.3. Data Realignment Block (Bit Slip) 2.5.1.4. Deserializer
2.5.2. Receiver Modes in Stratix® 10 Devices x
2.5.2.1. Non-DPA Mode 2.5.2.2. DPA Mode 2.5.2.3. Soft-CDR Mode
3. Stratix 10 High-Speed LVDS I/O Design Considerations x
3.1. PLLs and Clocking for Stratix® 10 Devices 3.2. Source-Synchronous Timing Budget 3.3. Guideline: LVDS SERDES IP Core Instantiation 3.4. Guideline: LVDS SERDES Pin Pairs for Soft-CDR Mode 3.5. Guideline: LVDS Transmitters and Receivers in the Same I/O Bank 3.6. Guideline: LVDS SERDES Limitation for Stratix® 10 GX 400, SX 400, and TX 400
3.1. PLLs and Clocking for Stratix® 10 Devices x
3.1.1. Clocking Differential Transmitters 3.1.2. Clocking Differential Receivers 3.1.3. Guideline: LVDS Reference Clock Source 3.1.4. Guideline: Use PLLs in Integer PLL Mode for LVDS 3.1.5. Guideline: Use High-Speed Clock from PLL to Clock LVDS SERDES Only 3.1.6. Guideline: Pin Placement for Differential Channels 3.1.7. LVDS Interface with External PLL Mode
3.1.6. Guideline: Pin Placement for Differential Channels x
3.1.6.1. PLLs Driving Differential Transmitter Channels 3.1.6.2. PLLs Driving DPA-Enabled Differential Receiver Channels 3.1.6.3. PLLs Driving DPA-Enabled Differential Receiver and Transmitter Channels in LVDS Interface Spanning Multiple I/O Banks
3.1.7. LVDS Interface with External PLL Mode x
3.1.7.1. IOPLL IP Signal Interface with LVDS SERDES IP 3.1.7.2. IOPLL Parameter Values for External PLL Mode 3.1.7.3. Connection between IOPLL IP and LVDS SERDES IP in External PLL Mode
3.2. Source-Synchronous Timing Budget x
3.2.1. Differential Data Orientation 3.2.2. Differential I/O Bit Position 3.2.3. Transmitter Channel-to-Channel Skew 3.2.4. Receiver Skew Margin for Non-DPA Mode
3.2.2. Differential I/O Bit Position x
3.2.2.1. Differential Bit Naming Conventions
3.2.4. Receiver Skew Margin for Non-DPA Mode x
3.2.4.1. RSKM Equation 3.2.4.2. Example: RSKM Calculation
3.5. Guideline: LVDS Transmitters and Receivers in the Same I/O Bank x
3.5.1. Using the Duplex Feature 3.5.2. Using an External PLL
4. Stratix® 10 High-Speed LVDS I/O Implementation Guides x
4.1. LVDS SERDES Intel® FPGA IP 4.2. LVDS SERDES IP Initialization and Reset 4.3. LVDS SERDES Intel® FPGA IP Timing 4.4. LVDS SERDES Intel® FPGA IP Design Examples 4.5. IP Migration Flow for Arria® V, Cyclone® V, and Stratix® V Devices
4.1. LVDS SERDES Intel® FPGA IP x
4.1.1. Release Information 4.1.2. LVDS SERDES Intel® FPGA IP Features 4.1.3. LVDS SERDES IP Core Functional Modes 4.1.4. LVDS SERDES IP Core Functional Description
4.1.4. LVDS SERDES IP Core Functional Description x
4.1.4.1. Serializer 4.1.4.2. DPA FIFO 4.1.4.3. Bitslip 4.1.4.4. Deserializer 4.1.4.5. Clock Phase Alignment
4.2. LVDS SERDES IP Initialization and Reset x
4.2.1. Initializing the LVDS SERDES IP in Non-DPA Mode 4.2.2. Initializing the LVDS SERDES IP in DPA Mode 4.2.3. Resetting the DPA 4.2.4. Word Boundaries Alignment
4.2.4. Word Boundaries Alignment x
4.2.4.1. Aligning Word Boundaries
4.3. LVDS SERDES Intel® FPGA IP Timing x
4.3.1. I/O Timing Analysis 4.3.2. FPGA Timing Analysis 4.3.3. Timing Analysis for the External PLL Mode 4.3.4. Timing Closure Guidelines for Internal FPGA Paths 4.3.5. Guideline: Use Clock Phase Alignment Block to Improve Timing Closure
4.3.1. I/O Timing Analysis x
4.3.1.1. Obtaining RSKM Report 4.3.1.2. Obtaining TCCS Report
4.4. LVDS SERDES Intel® FPGA IP Design Examples x
4.4.1. LVDS SERDES IP Synthesizable Quartus® Prime Design Examples 4.4.2. LVDS SERDES IP Simulation Design Example 4.4.3. Combined LVDS SERDES IP Transmitter and Receiver Design Example 4.4.4. LVDS SERDES IP Dynamic Phase Shift Design Example
4.5. IP Migration Flow for Arria® V, Cyclone® V, and Stratix® V Devices x
4.5.1. Migrating Your ALTLVDS_TX and ALTLVDS_RX IP Cores
5. LVDS SERDES Intel® FPGA IP References x
5.1. LVDS SERDES Intel® FPGA IP Parameter Settings 5.2. LVDS SERDES Intel® FPGA IP Signals 5.3. Comparison of LVDS SERDES Intel® FPGA IP with Stratix® V SERDES
5.1. LVDS SERDES Intel® FPGA IP Parameter Settings x
5.1.1. LVDS SERDES Intel® FPGA IP General Settings 5.1.2. LVDS SERDES Intel® FPGA IP PLL Settings 5.1.3. LVDS SERDES Intel® FPGA IP Receiver Settings 5.1.4. LVDS SERDES Intel® FPGA IP Transmitter Settings 5.1.5. LVDS SERDES IP Core Clock Resource Summary
5.1.3. LVDS SERDES Intel® FPGA IP Receiver Settings x
5.1.3.1. Receiver Input Clock Parameters Setup
5.1.4. LVDS SERDES Intel® FPGA IP Transmitter Settings x
5.1.4.1. Setting the Transmitter Output Clock Parameters
1. Stratix® 10 High-Speed LVDS I/O Overview
2. Stratix® 10 High-Speed LVDS I/O Architecture and Features
3. Stratix 10 High-Speed LVDS I/O Design Considerations
4. Stratix® 10 High-Speed LVDS I/O Implementation Guides
5. LVDS SERDES Intel® FPGA IP References
6. Stratix® 10 High-Speed LVDS I/O User Guide Archives
7. Document Revision History for the Stratix® 10 High-Speed LVDS I/O User Guide

2.5.1.1. DPA Block

The DPA block takes in high-speed serial data from the differential input buffer and selects one of the eight phases that the I/O PLLs generate to sample the data. The DPA chooses a phase closest to the phase of the serial data. The maximum phase offset between the received data and the selected phase is 1/8 unit interval (UI)1, which is the maximum quantization error of the DPA. The eight phases of the clock are equally divided, offering a 45° resolution.

Figure 9. DPA Clock Phase to Serial Data Timing RelationshipThis figure shows the possible phase relationships between the DPA clocks and the incoming serial data.


The DPA block continuously monitors the phase of the incoming serial data and selects a new clock phase if it is required. You can prevent the DPA from selecting a new clock phase by asserting the optional rx_dpa_hold port, which is available for each channel.

DPA circuitry does not require a fixed training pattern to lock to the optimum phase out of the eight phases. After reset or power up, the DPA circuitry requires transitions on the received data to lock to the optimum phase. An optional output port, rx_dpa_locked, is available to indicate an initial DPA lock condition to the optimum phase after power up or reset. Use data checkers such as a cyclic redundancy check (CRC) or diagonal interleaved parity (DIP-4) to validate the data.

An independent reset port, rx_dpa_reset, is available to reset the DPA circuitry. You must retrain the DPA circuitry after reset.

Note: The DPA block is bypassed in non-DPA mode.
1 The unit interval is the period of the clock running at the serial data rate (fast clock).
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