Agilex™ 7 FPGA I-Series Development Kit User Guide

ID 683288
Date 5/31/2024
Public
Document Table of Contents

4.2.5.1. The QSFPDD NRZ Tab

Figure 22. The QSFPDD NRZ Tab

The following sections describe controls in the QSFPDD NRZ tab.

Status

The Status control displays the following status information during the loopback test:

  • PLL Lock: Shows the PLL locked or unlocked state.
  • Pattern Sync: Shows the pattern synced or not state. The pattern is considered synced when the start of the data sequence is detected.
  • Detail: Shows the PLL lock and pattern sync status.

Control

Use the following controls to select an interface to apply PMA settings, data type, and error control:

  • QSFPDD0 x8
  • QSFPDD1 x8

PMA Setting

PMA allows you to make changes to the PMA parameters that affect the active transceiver interface. The following settings are available for analysis:

  • Serial Loopback: Displays the signal status between the transmitter and the receiver.
  • VOD: Specifies the voltage output differential of the transmitter buffer.
  • Pre-emphasis tap:
    • Pre-tap 1: Specifies the amount of pre-emphasis on the first pre-tap of the transmitter buffer.
    • Pre-tap 2: Specifies the amount of pre-emphasis on the second pre-tap of the transmitter buffer.
    • Post-tap 1: Specifies the amount of pre-emphasis on the post-tap of the transmitter buffer.
Figure 23. QSFPDD-PMA Setting

Data Type

The Data Type control specifies the type of data pattern contained in the transactions. Select the following available data types for analysis:

  • PRBS7: Pseudo-random 7-bit sequences.
  • PRBS15: Pseudo-random 15-bit sequences.
  • PRBS23: Pseudo-random 23-bit sequences.
  • PRBS31: Pseudo-random 31-bit sequences (default).
  • High_freq: Selects the highest frequency divided-by-2 data pattern 10101010.
  • Low_freq: Selects the lowest frequency divided-by-33 data pattern.

Error Control

This control displays data errors detected during analysis and allows you to insert errors:

  • Detected Errors: Displays the number of data errors detected in the received bitstream.
  • Inserted Errors: Displays the number of errors inserted into the transmit datastream.
  • Bit Error Rate: Calculates the bit error rate of the transmit data stream.
  • Insert: Insert a one-word error into the transmit data stream each time you click the button. Insert error is only enabled during transaction performance analysis.
  • Clear: Resets the Detected Errors counter and Inserted Errors counter to zeros.

Run Control

  • TX and RX performance bars: Show the percentage of the maximum theoretical data rate that the requested transactions are able to achieve.
  • Start: This control initiates the loopback tests.
  • Data Rate: Displays the XCVR type and data rate of each channel.
Figure 24. XCVR-Data Rate