Summary• Two categories of channel/interconnect => different design targets/priorities• Explicit electrical design targets per the USB4 spec• Loss => ISI => DDJ• Return loss• Optimize trace geometry for Impedance, loss, and cross talk• Routing practices• Reduce cross talk by interleaved routing• Avoid via stubs• Optimize the placement of discrete components (e.g. AC-caps, ESD, etc)• Layout design guidelines• Fiberweave effect and mitigation techniques• Correct values and voltage rating of Rs and Cs• Choose an ESD with better or equal to the recommended electrical performance• PCB dielectric material and copper has large impact on trace loss at USB4 data rates