F-Tile Architecture and PMA and FEC Direct PHY IP User Guide

ID 683872
Date 1/24/2024
Public
Document Table of Contents
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3.12.1. FHT PMA Settings

RX invert P and N: To swap RX P and N serial lanes.

set_instance_assignment -name HSSI_PARAMETER "rx_invert_p_and_n=<parameter_value>" -to <RX_SERIAL_PIN> -entity <TOP_LEVEL_NAME>

Example:

set_instance_assignment -name HSSI_PARAMETER "rx_invert_p_and_n=RX_INVERT_PN_EN" -to rx_serial_data[0] -entity top

RX termination: This setting is for all lanes.

set_instance_assignment -name HSSI_PARAMETER "rx_termination=<parameter_value>" -to <RX_SERIAL_PIN> -entity <TOP_LEVEL_NAME>
Possible parameter values are:
  • RXTERM_OFFSET_P0 (90 Ohms)
  • RXTERM_OFFSET_P2 (94.6 Ohms)
  • RXTERM_OFFSET_P3 (97.7 Ohms)
  • RXTERM_OFFSET_P4 (100 Ohms)
  • RXTERM_OFFSET_P5 (102.3 Ohms)
  • RXTERM_OFFSET_P6 (105.4 Ohms)
  • RXTERM_OFFSET_P7 (107.7 Ohms)
  • RXTERM_OFFSET_P8 (110 Ohms)
  • RXTERM_OFFSET_M4 (80.8 Ohms)
  • RXTERM_OFFSET_M5 (83.1 Ohms)
  • RXTERM_OFFSET_M6 (85.4 Ohms)
  • RXTERM_OFFSET_M7 (87.7 Ohms)

Example:

set_instance_assignment -name HSSI_PARAMETER "rx_termination=RXTERM_OFFSET_P0" -to rx_serial_data[0] -entity top

TX invert P and N: To swap TX P and N serial lanes.

set_instance_assignment -name HSSI_PARAMETER "tx_invert_p_and_n=<parameter_value>" -to <TX_SERIAL_PIN> -entity <TOP_LEVEL_NAME>

Example:

set_instance_assignment -name HSSI_PARAMETER "tx_invert_p_and_n=TX_INVERT_PN_EN" -to tx_serial_data[0] -entity top

TX termination: This setting is for all lanes.

set_instance_assignment -name HSSI_PARAMETER "tx_termination=<TXTERM_OFFSET_NAME>" -to <TX_SERIAL_PIN> -entity <TOP_LEVEL_NAME>
Possible parameter values are:
  • TXTERM_OFFSET_M1(96.8 Ohms)
  • TXTERM_OFFSET_P0(90 Ohms)

Example:

set_instance_assignment -name HSSI_PARAMETER "tx_termination=TXTERM_OFFSET_P0" -to tx_serial_data[0] -entity top

TX out tristate enable: Tx driver tristate enable.

set_instance_assignment -name HSSI_PARAMETER "txout_tristate_en=<parameter_value>" -to <TX_SERIAL_PIN> -entity <TOP_LEVEL_NAME>

Example:

set_instance_assignment -name HSSI_PARAMETER "txout_tristate_en=TXOUT_TRISTATE_EN" -to tx_serial_data[0] -entity top

TX equalization:

Post tap: Valid register settings for the parameter value are 0-63

set_instance_assignment -name HSSI_PARAMETER "txeq_post_tap_<n>=<parameter_value>" -to <TX_SERIAL_PIN> -entity <TOP_LEVEL_NAME>

Pre tap: Valid register settings for the parameter value are 0-63

set_instance_assignment -name HSSI_PARAMETER "txeq_pre_tap_<n>=<parameter_value>" -to <TX_SERIAL_PIN> -entity <TOP_LEVEL_NAME>

Main tap: Valid register settings for the parameter value are 0-127

set_instance_assignment -name HSSI_PARAMETER "txeq_main_tap=<parameter_value>" -to <TX_SERIAL_PIN> -entity <TOP_LEVEL_NAME>

Example:

Post tap:

set_instance_assignment -name HSSI_PARAMETER "txeq_post_tap_1=0" -to tx_serial_data[0] -entity top
set_instance_assignment -name HSSI_PARAMETER "txeq_post_tap_2=0" -to tx_serial_data[0] -entity top
set_instance_assignment -name HSSI_PARAMETER "txeq_post_tap_3=0" -to tx_serial_data[0] -entity top
set_instance_assignment -name HSSI_PARAMETER "txeq_post_tap_4=0" -to tx_serial_data[0] -entity top

Pre tap:

set_instance_assignment -name HSSI_PARAMETER "txeq_pre_tap_3=0" -to tx_serial_data[0] -entity top
set_instance_assignment -name HSSI_PARAMETER "txeq_pre_tap_2=0" -to tx_serial_data[0] -entity top
set_instance_assignment -name HSSI_PARAMETER "txeq_pre_tap_1=0" -to tx_serial_data[0] -entity top

Main tap:

set_instance_assignment -name HSSI_PARAMETER "txeq_main_tap=83" -to tx_serial_data[0] -entity top