Ok, this is clear for me.
I think you can increase the number of pulses. The following links might be helpful:
https://optics.ansys.com/hc/en-us/articles/360036618013-PRBS-Generator-PRBS-INTERCONNECT-Element
https://optics.ansys.com/hc/en-us/articles/360036736813-Root-Element-ROOT-INTERCONNECT-Element
https://optics.ansys.com/hc/en-us/articles/360045467653-Time-Domain-Simulations-Introduction-to-INTERCONNECT-Time-Domain-Simulations-Demo
%bitrate% is the bitrate inherited from the root element. If you want to manually specify a value that is not dependent on the bitrate, you would need to remove this expression.
You can see the bitrate is calculated as 0.75*%bitrate%, where %bitrate% is the bitrate inherited from the root element. the “bitrate” in Root Element is the symbol rate, and please modify the “bitrate” in the PRBS based on the modulation format for correct bitrate.
You can probably find more information about PRBS and eye disgram in the KB website.