GTS Ethernet Intel® FPGA Hard IP User Guide

ID 817676
Date 8/05/2024
Public
Document Table of Contents

3.6. Analog Parameter Options

You can tune the analog functions of GTS PMAs to design high-speed serial protocol solutions by using the transceiver's analog parameter settings. This feature allows you to compensate for signal losses in high-data-rate communications.

To configure the Analog TX and Analog RX parameters of the PMA, access the Analog Parameters tab in the GTS Ethernet Intel® FPGA Hard IP GUI.

Figure 10. Analog Parameter Options in Parameter Editor
Note: Additionally, you can specify the analog parameters in the .qsf file, which take precedence over the analog parameter settings in the IP GUI. Setting these parameters via the .qsf file overrides the settings in the GUI.
#TX Analog Parameter Configuration
set_instance_assignment -name HSSI_PARAMETER "tx_invert_p_and_n=ENABLE" -to <TX_SERIAL_PIN> -entity <TOP_LEVEL_NAME>
set_instance_assignment -name HSSI_PARAMETER "tx_eq_post_tap_1=5" -to <TX_SERIAL_PIN> -entity <TOP_LEVEL_NAME>
set_instance_assignment -name HSSI_PARAMETER "tx_eq_main_tap=52" -to <TX_SERIAL_PIN> -entity <TOP_LEVEL_NAME>
set_instance_assignment -name HSSI_PARAMETER "tx_eq_pre_tap_1=0" -to <TX_SERIAL_PIN> -entity <TOP_LEVEL_NAME>
set_instance_assignment -name HSSI_PARAMETER "tx_eq_pre_tap_2=0" -to <TX_SERIAL_PIN> -entity <TOP_LEVEL_NAME>

#RX Analog Parameter Configuration
set_instance_assignment -name HSSI_PARAMETER "rx_invert_p_and_n=ENABLE" -to <RX_SERIAL_PIN> -entity <TOP_LEVEL_NAME>
set_instance_assignment -name HSSI_PARAMETER "rx_external_couple_type=RX_EXTERNAL_COUPLE_TYPE_AC" -to <RX_SERIAL_PIN> -entity <TOP_LEVEL_NAME> 
set_instance_assignment -name HSSI_PARAMETER "rx_termination_mode=RX_TERMINATION_MODE_GROUNDED" -to <RX_SERIAL_PIN> -entity <TOP_LEVEL_NAME> 
set_instance_assignment -name HSSI_PARAMETER "rx_onchip_termination_setting=RX_ONCHIP_TERMINATION_SETTING_R_2" -to <RX_SERIAL_PIN> -entity <TOP_LEVEL_NAME>
Table 16.  GTS PMA Analog Parameter Settings
Parameter Values Default Setting Description
Analog TX
Enable TX P&N Invert
  • Enable
  • Disable
Disable Invert TX serial outputs P and N pins.
TX EQ Post Tap 1, 1.0 step size 0 to 19 5 TX equalization control for Post Tap 1.
TX EQ Main Tap, 1.0 step size 0 to 55 52 TX equalization control for Main Tap.
TX EQ Pre Tap 1, 1.0 step size 0 to 15 0 TX equalization control for Pre Tap 1.
TX EQ Pre Tap 2, 1.0 step size 0 to 7 0 TX equalization control for Pre Tap 2.
Analog RX
Enable RX P&N Invert
Note: This feature is preliminarily and is planned to be fully supported in a future Quartus® Prime Pro Edition software release.
  • Enable
  • Disable
Disable Invert RX serial input P and N pins.
RX External Coupling Mode
  • AC
  • DC
AC Specifies the type of external on-board coupling mode.
Selects value of RX termination mode
  • GROUNDED
  • DIFFERENTIAL
GROUNDED Specifies the RX PMA buffer termination mode.

GROUNDED mode is used for AC coupled link.

DIFFERENTIAL mode is used for DC coupled link.

Selects value of RX onchip termination
  • R_1
  • R_2
  • R_3
  • R_4
R_2 Selects RX on-chip termination resistor value.