usb enumeration flow

訊號傳輸 傳輸線理論 USB採用 lossless transmission line 的copper wire,此種線不會吸收傳輸訊號的能量 訊號在傳輸線傳遞是會有延遲的,不能忽略 傳輸過程都要盡量阻抗匹配,要不然會產生反射波,導致訊號錯誤

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