Intel® Stratix® 10 TX Transceiver Signal Integrity Development Kit User Guide

ID 683591
Date 9/27/2019
Public
Document Table of Contents

5.3.6. The PAM4 Tab

The PAM4 tab allows you to perform loopback tests on the SMAA, SMAB, QSFPDD1x1A and QSFPDD1x1B port. Install QSFPDD loopback module and cable for QSFPDD1x1 and 2.4 mm Rf connectors, configure FPGA with PAM4 image.

Figure 19. The PAM4 Tab

The following sections describe the controls on the PAM4 tab.

Status

Displays the following status information during a loopback test:
  • PLL Lock: Shows the PLL locked or unlocked state.
  • Pattern Sync: Shows the pattern synced or not synced state. The pattern is considered synced when the start of the data sequence is detected.
  • Details: Shows the details of PLL lock, pattern status and error bits of each channel.
Figure 20. SMA Status

Figure 21. QSFPDD1X1 Status

Port

Allows you to specify which interface to test. The following port tests are available: SMAx2, OSFPx8 and QSFPDDx8.

PMA Setting

Allows you to make changes to the PMA parameters that affect the active transceiver interface. The following settings are available for analysis:
  • Serial Loopback: Routes signals 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.
    • Pre-tap 3: Specifies the amount of pre-emphasis on the third pre-tap of the transmitter buffer.
    • Post-tap 1: Specifies the amount of pre-emphasis on the first post-tap of the transmitter buffer.
  • Equalizer: Specifies the RX tuning mode for receiver equalizer.
Figure 22. SMA PMA Setting

Figure 23. QSFPDD1X1 PMA Setting

Data Type

Specifies the type of data contained in the transactions. The following data types are available for analysis.
  • PRBS 7: Selects pseudo-random 7-bit sequences.
  • PRBS 9: Selects pseudo-random 9-bit sequences.
  • PRBS 11: Selects pseudo-random 11-bit sequences.
  • PRBS 15: Selects pseudo-random 15-bit sequences.
  • PRBS 23: Selects pseudo-random 23-bit sequences.
  • PRBS 31: Selects pseudo-random 31-bit sequences.

Error Control

Displays data errors detected during analysis and allows you to insert errors:
  • Detected Errors: Displays the number of data errors detected in the hardware.
  • Inserted Errors: Displays the number of errors inserted into the transmit data stream.
  • Bit Error Rate: Displays the error rate of data transaction.
  • Insert: Inserts a one-word error into the transmit data stream each time you click the button. Insert is enabled only during transaction performance analysis.
  • Clear: Resets the Detected errors and Inserted errors counters to zeroes.

Run Control

TX and RX performance bars: Show the percentage of maximum theoretical data rate that the requested transactions are able to achieve.

Start: This toggle button initiates and stops the tests.

Tx (Mbps) and Rx (Mbps): Show the number of bytes of data analyzed per second.