Application note(PDF) on the design of various USB controllers from Microchip.
The purpose of this application note is to provide a list of items that need to be considered when designing systems that incorporate the following categories of Microchip USB products:
-USB 2.0 Hubs
-USB 3.0 Hubs
-Flash Media Controllers
-Flash Media Controller Hub Combo
The target audience of this document is system engineers and layout professionals who are familiar with industry standard practices. This application note must be used in conjunction with the device data sheet, reference design, and other relevant application notes.