I am designing a system with a carrier board that has all of active logic on one board and most connectors on a backplane board. The interface between the two boards is a x16 PCIe board edge connector. Over the edge connector I intend to route USB 3.1 (5 Gbit/s) from the source device (μPD720202) to a USB 3 A receptacle. On the carrier board the SSTX and SSRX lines are at most 30mm and length matched to less than 1mil. The USB traces are routed like PCIe signals would be on the edge connector:
- How practical is this?
- What issues might I run up against?
- How long can I make the traces on the backplane? This document suggests <200mm (https://docs.toradex.com/102492-layout-design-guide.pdf)