引用:
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作者seisyuku
不對，USB2.0才有High speed, Full speed, low speed三種規範。
而low speed就是USB1.1的相容模式，故只有一種。
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請問哪裡不對? 1.1本來就有full speed和low speed兩種模式
full speed和low speed跑的速度也完全不同
您指的只有一種 難道是 1.1 只有12Mb一種速度?
請看USB spec R1.1
Chapter 6.1 Architectural overview:
The USB can operate at TWO speeds. Full-speed, 12Mb/s, requires the use of a shielded cable with two power conductors and twisted pair signal conductors. Low-speed. 1.5Mb/s, relaxes the cable requirement. Low-speed cable does not require shielding or twisted pair signal conductors.