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USB CDC 最快傳輸速度?



想請問有人知道 USB CDC模式傳輸的最快速度為多少嗎?  

1.網路上查到的資料都說最快到1M,但在full speed的狀況下應該會有12M的速率,為何會掉這麼多?

2.是否受限在 Baud rate ,如果將 Baud rate 提升,CDC傳輸速度是否會變快?

3.如果希望USB能夠已6~8M速度傳輸資料,要如何做才能辦到?