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MSP430F5529 PUR管脚 和DM ,电阻决定速度?以及是否做阻抗匹配

Other Parts Discussed in Thread: MSP430F5529

如下图,参考TI的原理图设计,,MSP430F5529 PUR管脚 和DM ,电阻决定速度?
这个是什么原理?  另外USB线需要做阻抗匹配吗?