DAxP/N and DB*P/N pairs should be routed with controlled 100-Ω differential impedance (± 15%) or 50-Ω single-ended impedance (± 15%).
Keep away from other high speed signals.
Keep lengths to within 5 mils of each other.
Length matching should be near the location of mismatch.
Each pair should be separated at least by 3 times the signal trace width.
The use of bends in differential traces should be kept to a minimum. When bends are used, the number of left and right bends should be as equal as possible and the angle of the bend should be ≥ 135 degrees. This will minimize any length mismatch causes by the bends and; therefore, minimize the impact bends have on EMI.
Route all differential pairs on the same of layer.
The number of VIAS should be kept to a minimum. It is recommended to keep the VIAS count to 2 or less.
Keep traces on layers adjacent to ground plane.
Do NOT route differential pairs over any plane split.
Adding Test points will cause impedance discontinuity and will; therefore, negatively impact signal performance. If test points are used, they should be placed in series and symmetrically. They must not be placed in a manner that causes a stub on the differential pair.