Differential pair for USB type B and AB

[ican7]

Hi Robert , I have a reference design I am working on and there are two USB connectors and each connected to a micro controller and there are two micro controllers in total. The USB connectors are type AB and B. How can I determine what impedance value they used for the differential pairs coming from the micro-controllers to the USB connectors ?

[robertferanec]

USB 2.0 is normally routed by 90 OHMS Differential and 45 Single ended. Here is an example of a design guide (see page 183): COM Express Carrier Design Guide

Please, did my other answers help you? You have never replied to them. Thanks.

[ican7]

Thank you Robert , I found the answer in the guide you provided.