Due to a problem in Intel® Quartus® Prime Pro Edition Software version 22.4 and earlier, HSSI_PARAMETER assignments are missing in the .qsf file of Serial Lite IV hardware example design on F-Tile of Intel Agilex® devices. As a result, hardware tests may fail in external loopback mode.
To work around this problem in Intel® Quartus® Prime Pro Edition Software version 22.4 and earlier, the user needs to add HSSI_PARAMETER assignments in the .qsf file manually to set values below:
txeq_main_tap, txeq_pre_tap_1, txeq_pre_tap_2, txeq_post_tap_1, rx_ac_couple_enable, rx_onchip_termination
Please refer to F-tile Architecture and PMA and FEC Direct PHY IP User Guide for assignment values and examples.
This problem has been resolved in the Intel® Quartus® Prime Pro Edition Software version 23.1.