58.4.9.2 Printed Circuit Board (PCB)

To minimize the inductive and capacitive parasitics associated with XIN, XOUT, XIN32 and XOUT32 nets, it is recommended to route them as short as possible. Additionally, it is important to keep these nets away from noisy switching signals (clock, data, PWM, and so on), and shield them with a quiet ground net to avoid coupling to neighboring signals.