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

ID 683872
Date 1/24/2024
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3.12.2. FGT PMA Settings

RX on-chip termination:

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

Example:

set_instance_assignment -name HSSI_PARAMETER "rx_onchip_termination=RX_ONCHIP_TERMINATION_R_2" -to rx_serial_data[0] -entity top
Possible parameter values are:
  • RX_ONCHIP_TERMINATION_R_1 : 85 Ohms.
  • RX_ONCHIP_TERMINATION_R_2 : 100 Ohms.

RX AC coupling:

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

Example:

set_instance_assignment -name HSSI_PARAMETER "rx_ac_couple_enable=ENABLE" -to rx_serial_data[0] -entity top
Possible parameter values are:
  • ENABLE : when you use on board AC coupling capacitors.

  • DISABLE : when you do not use on board AC coupling capacitors.

TX Equalization:

set_instance_assignment -name HSSI_PARAMETER "txeq=<parameter_value>" -to <TX_SERIAL_PIN> -entity <TOP_LEVEL_NAME>
Valid parameter values:
  • main_tap: 0-55
  • pre_tap_1: 0-15
  • pre_tap_2: 0-7
  • post_tap: 0-19

Examples:

set_instance_assignment -name HSSI_PARAMETER "txeq_main_tap=35" -to tx_serial_data[0] -entity top
set_instance_assignment -name HSSI_PARAMETER "txeq_pre_tap_1=5" -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_post_tap_1=0" -to tx_serial_data[0] -entity top

Manual Tunning:

Bypass RX Auto Adaptation

set_instance_assignment -name HSSI_PARAMETER "flux_mode=FLUX_MODE_BYPASS" -to <RX_SERIAL_PIN> -entity <TOP_LEVEL_NAME>
set_instance_assignment -name HSSI_PARAMETER "rx_adapt_mode=RX_ADAPT_MODE_STATIC_EQ" -to <RX_SERIAL_PIN> -entity <TOP_LEVEL_NAME>

RX Manual Equalization

  • VGA:
    set_instance_assignment -name HSSI_PARAMETER "rxeq_vga_gain=<parameter_value>" -to <RX_SERIAL_PIN> -entity <TOP_LEVEL_NAME>

    Valid parameter values are 0-63.

  • High-frequency boost:
    set_instance_assignment -name HSSI_PARAMETER "rxeq_hf_boost =<parameter_value>" -to  <RX_SERIAL_PIN> -entity <TOP_LEVEL_NAME>

    Valid parameter values are 0-63.

  • DFE Tap 1:
    set_instance_assignment -name HSSI_PARAMETER "rxeq_dfe_data_tap_1=<parameter_value>" -to  <RX_SERIAL_PIN> -entity <TOP_LEVEL_NAME>

    Valid parameter values are 0-63.

VSR is set when insertion loss < 10dB, RX auto adaptation is ON for >= 23 Gbps NRZ or any PAM4 rate:
  • For Insertion Loss <8dB:

    set_instance_assignment -name HSSI_PARAMETER "vsr_mode=VSR_MODE_LOW_LOSS" -to <RX_SERIAL_PIN> -entity < TOP_LEVEL_NAME>
  • For Insertion Loss > 8dB but < 10dB:

    set_instance_assignment -name HSSI_PARAMETER "vsr_mode=VSR_MODE_HIGH_LOSS" -to <RX_SERIAL_PIN> -entity < TOP_LEVEL_NAME>
  • Else VSR_MODE_DISABLE is set by default by the Intel® Quartus® Prime Pro Edition software for rates below < 23 Gbps where VSR is not required.