F-Tile Architecture and PMA and FEC Direct PHY IP User Guide
A.6.3.2. F-Tile FGT Transmitter Setting Recommendations
The recommended TX equalization settings are shown as a reference point so that you can narrow your sweeping range of each TX equalization tap. These settings are found based on the figure of merit, such as BER measurement and eye height value using the F-Tile FGT Hardware Setup You can download the TX equalization sweeping scripts from the example designs provided in F-Tile FGT Tuning Examples .
Insertion Loss | Data Rate <= 17Gbps | Data Rate > 17Gbps | QSF Assignment or Quartus® Prime Setting |
---|---|---|---|
0 < IL <= 10dB | main_tap = 55 pre_tap_1 = 0 pre_tap_2 = 0 post_tap_1 = 0 |
main_tap = 55 pre_tap_1 = 0 pre_tap_2 = 0 post_tap_1 = 0 |
set_instance_assignment -name HSSI_PARAMETER "vsr_mode=VSR_MODE_LOW_LO SS" -to <RX_SERIAL_PIN> -entity <TOP_LEVEL_NAME>OR select VSR_MODE_LOW_LOSS in the Analog Parameters tab in the Quartus® Prime IP Parameter Editor. |
10dB < IL <= 20dB | main_tap = 55 pre_tap_1 = 5 pre_tap_2 = 0 post_tap_1 = 0 |
main_tap = 55 pre_tap_1 = 5 pre_tap_2 = 0 post_tap_1 = 0 |
set_instance_assignment -name HSSI_PARAMETER "vsr_mode=VSR_MODE_DISABLE" -to <RX_SERIAL_PIN> -entity <TOP_LEVEL_NAME>OR select VSR_MODE_DISABLE in the Analog Parameters tab in the Quartus® Prime IP Parameter Editor. |
20dB < IL <= 30dB | main_tap = 55 pre_tap_1 = 5 pre_tap_2 = 0 post_tap_1 = 5 |
main_tap = 55 pre_tap_1 = 10 pre_tap_2 = 2 post_tap_1 = 0 |
set_instance_assignment -name HSSI_PARAMETER "vsr_mode=VSR_MODE_DISABLE" -to <RX_SERIAL_PIN> -entity <TOP_LEVEL_NAME>OR select VSR_MODE_DISABLE in the Analog Parameters tab in the Quartus® Prime IP Parameter Editor. |
Insertion Loss | Data Rate <= 17Gbps | Data Rate > 17Gbps | QSF Assignment or Quartus® Prime Setting |
---|---|---|---|
0 < IL <= 10dB | C(0) = 1 C(-1) = 0 C(-2) = 0 C(1) = 0 |
C(0) = 1 C(-1) = 0 C(-2) = 0 C(1) = 0 |
set_instance_assignment -name HSSI_PARAMETER "vsr_mode=VSR_MODE_LOW_LO SS" -to <RX_SERIAL_PIN> -entity <TOP_LEVEL_NAME>OR select VSR_MODE_LOW_LOSS in the Analog Parameters tab in the Quartus® Prime IP Parameter Editor. |
10dB < IL <= 20dB | C(0) = 0.9 C(-1) = 0.1 C(-2) = 0 C(1) = 0 |
C(0) = 0.9 C(-1) = 0.1 C(-2) = 0 C(1) = 0 |
set_instance_assignment -name HSSI_PARAMETER "vsr_mode=VSR_MODE_DISABLE" -to <RX_SERIAL_PIN> -entity <TOP_LEVEL_NAME>OR select VSR_MODE_DISABLE in the Analog Parameters tab in the Quartus® Prime IP Parameter Editor. |
20dB < IL <= 30dB | C(0) = 0.82 C(-1) = 0.1 C(-2) = 0 C(1) = 0.1 |
C(0) = 0.79 C(-1) = 0.18 C(-2) = 0.03 C(1) = 0 |
set_instance_assignment -name HSSI_PARAMETER "vsr_mode=VSR_MODE_DISABLE" -to <RX_SERIAL_PIN> -entity <TOP_LEVEL_NAME>OR select VSR_MODE_DISABLE in the Analog Parameters tab in the Quartus® Prime IP Parameter Editor. |