I use tlk2711 with counter pattern through transmitter->receptor. But I have an external clock generator problem for the TLK2711 reference clock (TXCLK-GTX_CLK). When I use a function generator (out 50ohm) for the reference clock the data output from transceiver are correct. But when I use output clock MRCC of FPGA kintex for the reference clock the data output from transceiver are not correct.
I think the problem come from unmatched impedance output lvcmos 2.5 FPGA. But the digital control impedance don’t work on 2.5V FPGA bank.
Other idea, comment?
Regards,