Why doesn't serial loopback enable work in manual tuning mode when I use the example design’s TCL script during hardware testing?

Description

Due to a problem in the Quartus® Prime Pro edition software version 25.1.1 and earlier, the serial loopback enable sequence in the configure_silb process in ftile_xcvr_cfgcsr_inc.tcl in the hardware_test_design folder of the example design may not work correctly in manual tuning mode when using the example design’s TCL script.

• CPI_assert_req $channel $::SET_SILB($lane_number) 
• CPI_assert_req $channel $::RESET_LANE($lane_number) 
• CPI_assert_req $channel $::SET_MODE($lane_number) 
• CPI_assert_req $channel $::DISABLE_DSP_ADAPT($lane_number) 

Resolution

To work around this problem, refer to the Quartus version 25.1.1 and onwards of the F-Tile Architecture and PMA and FEC Direct PHY IP User Guide chapter A.3 or A.4 steps to implement serial loopback enable or disable sequences in manual tuning mode. 

You can also refer to the ttk_helper_ftile.tcl script downloadable from this user guide.