I am designing a board around the RBp CM3+ and would like to know more about how to wire the camera and USB pins. On the RBp CM3+ data sheet, it is stated that the USB pins like USB_P and USB_M must be routed as 90 Ohm differential traces. I also read somewhere that the camera pins (CAM1_DN0, CAM1_DNP, etc) need to be routed as matched length 100 Ohm differential pairs.
Does this mean that the differential impedance must be around 100 Ohms?
Other than ensuring that the differential traces have the same length and differential impedance, are there any other consideration I should have?
I'm also having trouble understanding the difference between an edge coupled microstrip, microstrips, and embedded microstrips