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问下各位大佬几个关于TUSB8041的问题

Other Parts Discussed in Thread: TUSB8041A

根据官网给的手册画好了pcb连线的时候,发现USB有些需要差分信号线,但是官网数据手册上只是写了必须设计阻抗在90欧姆左右,并不是很了解怎么计算,希望大佬给点提示,线宽和线距还有线的长度有哪些要求,谢谢!!!