Bonded Mode support for GXT transceivers in L-tile stratix 10 FPGA

Hie, Your following conclusion is correct: "So, my conclusion is either L-tile or H-tile XCVR doesn't support x2 bonded mode for more than 17Gbps link rate." As for channel skew, it depends on the clocking and device used. Please refer to Stratix 10 datasheet link below https://www.intel.com/content/dam/www/programmable/us/en/pdfs/literature/hb/stratix-10/s10_datasheet.pdf Table 43 for L-tile and Table 54 for H-tile. Regards, Nathan