Hello. In shematic review check list, for GEM clock, requirements are described - " Delay by 1.5 - 2 ns with respect to average delay of data"
But i can not add this delay - this delay requaired length of trace 214 mm.
Someone will tell me if I understand thшы requirements?
you could always rely on the PHY to perform this delay. All PHYs have some form of SW programmable delay control on the signals between the PHY & MAC. Some have minimal sets of pin that are adjustable when others have full sets.