I have a BeMicro CV low cost dev board from Altera. It features a Cyclone V.
They routed impedance controlled differential lines to some dual 2.54mm standard headers.
See the at the top of the picture below:
It seems that they cared about the controlled impedance, and also the line lengths.
I would like to connect a 1000Mbit PHY with GMII interface (parallel 125MHz clock).
Can I plug a daughter board to this one and convey the 125MHz signals using a simple 2.45mm header?