Sniper2 , 07-18-2025, 07:19 PM
Hi,So i have a design that uses 1 SGMII 1GB Ethernet interface and i have 2 problems:A) Do i need to length math the 2 pairs? If yes to what value? Also do the coupling caps need to be in the middle? or it even matters? B) I seed to swithc them around like in a X . I have a 6L PCB should i go to bottom layers and then go under the other pair or go the L3 and do it there? (L2 L5 are GND) in a way from a Feranec video stubs should not be a big problem at 1GBbut still not sure what is the best way .C*) this is a thing that is part of B in a way , Can i invert polarity of the serdes signals like connect the _P to _N ?