LVDS SERDES Intel® FPGA IP User Guide: Intel® Arria® 10 and Intel® Cyclone® 10 GX Devices

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ID 683520
Date 9/20/2022
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LVDS SERDES Intel® FPGA IP User Guide: Intel® Arria® 10 and Intel® Cyclone® 10 GX Devices
LVDS SERDES Intel® FPGA IP User Guide: Intel® Arria® 10 and Intel® Cyclone® 10 GX Devices x
Release Information LVDS SERDES Intel® FPGA IP Features LVDS SERDES IP Core Functional Modes LVDS SERDES IP Core Functional Description LVDS SERDES IP Initialization and Reset LVDS SERDES Intel® FPGA IP Signals LVDS SERDES Intel® FPGA IP Parameter Settings LVDS SERDES Intel® FPGA IP Timing LVDS SERDES Intel® FPGA IP Design Examples Additional LVDS SERDES IP Core References LVDS SERDES Intel® FPGA IP User Guide Archives Document Revision History for LVDS SERDES Intel® FPGA IP User Guide: Intel® Arria® 10 and Intel® Cyclone® 10 GX Devices
LVDS SERDES IP Core Functional Description x
Serializer DPA FIFO Bitslip Deserializer
LVDS SERDES IP Initialization and Reset x
Initializing the LVDS SERDES IP in Non-DPA Mode Initializing the LVDS SERDES IP in DPA Mode Resetting the DPA Word Boundaries Alignment Aligning with Control Characters Aligning without Control Characters
Word Boundaries Alignment x
Aligning with Control Characters Aligning without Control Characters Aligning Word Boundaries
LVDS SERDES Intel® FPGA IP Parameter Settings x
LVDS SERDES Intel® FPGA IP General Settings LVDS SERDES Intel® FPGA IP PLL Settings LVDS SERDES Intel® FPGA IP Receiver Settings LVDS SERDES Intel® FPGA IP Transmitter Settings LVDS SERDES IP Core Clock Resource Summary
LVDS SERDES Intel® FPGA IP Receiver Settings x
Receiver Input Clock Parameters Setup
LVDS SERDES Intel® FPGA IP Transmitter Settings x
Setting the Transmitter Output Clock Parameters
LVDS SERDES Intel® FPGA IP Timing x
I/O Timing Analysis FPGA Timing Analysis Timing Analysis when Using PLL Core Clocks Timing Closure Guidelines for Internal FPGA Paths
I/O Timing Analysis x
Obtaining RSKM Report Obtaining TCCS Report
LVDS SERDES Intel® FPGA IP Design Examples x
LVDS SERDES IP Synthesizable Intel® Quartus® Prime Design Examples LVDS SERDES IP Simulation Design Example Combined LVDS SERDES IP Transmitter and Receiver Design Example LVDS SERDES IP Dynamic Phase Shift Design Example
Additional LVDS SERDES IP Core References x
IP Migration Flow for Arria® V, Cyclone® V, and Stratix® V Devices LVDS Interface with External PLL Mode LVDS Transmitters and Receivers in the Same I/O Bank Comparison of LVDS SERDES IP Core with Stratix® V SERDES
IP Migration Flow for Arria® V, Cyclone® V, and Stratix® V Devices x
Migrating Your ALTLVDS_TX and ALTLVDS_RX IP Cores
LVDS Interface with External PLL Mode x
IOPLL IP Signal Interface with LVDS SERDES IP IOPLL Parameter Values for External PLL Mode Connection between IOPLL IP and LVDS SERDES IP in External PLL Mode
LVDS SERDES Intel® FPGA IP User Guide: Intel® Arria® 10 and Intel® Cyclone® 10 GX Devices

Word Boundaries Alignment

You can perform word boundaries alignment with or without control characters in your data stream. If there are no training patterns or control characters available in the serial bit stream to use for word alignment, Intel recommends that you use the non-DPA mode.

Aligning with Control Characters

By adding control characters in the data stream, your logic can search for a known pattern to align the word boundaries. You can compare the received data for each channel, and then pulse the rx_bitslip_ctrl signal as required until you receive the control character.

Note: Intel recommends that you set the bit slip rollover count to the deserialization factor or higher. This setting allows enough depth in the bit slip circuit to roll through an entire word, if required.

Aligning without Control Characters

Without control characters in the data stream, you need a deterministic relationship between the reference clock and the data. With the deterministic relationship, you can predict the word boundary using timing simulation or laboratory measurement. You can only use deterministic relationship in non-DPA mode.

The only way to ensure a deterministic relationship on the default word position in the SERDES when the device powers up, or anytime the PLL is reset, is to have a reference clock equal to the data rate divided by the deserialization factor. This is important because the PLL locks to the rising edge of the reference clock. If you have one rising edge on the reference clock per serial word received, the deserializer always starts at the same position.

For example, if the data rate is 800 Mbps and the deserialization factor is 8, the PLL requires a 100 MHz reference clock.

Using timing simulation, or lab measurements, monitor the parallel words received and determine how many pulses of the rx_bitslip_ctrl you require to set your word boundaries. You can create a simple state machine to apply the required number of pulses after you enter user mode or at any time after you reset the PLL.

Note: If you are using the DPA or soft-CDR modes, the word boundary is not deterministic. The initial training of the DPA allows it to move forward or backward in phase relative to the incoming serial data. Therefore, there can be a ±1 bit of variance in the serial bit where the DPA locks initially.

Section Content
Aligning Word Boundaries

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