TUSB216I：使用RedriverIC，应用10M长的USB2.0线束上（两端加Redriver），USB供电5V 500mA，怎么测试USB信号传输质量（没有眼图测试设备），如何测试USB的传输速率（ full speed）

Hi Berry,

Could you please send this question in English so we can discuss it? Thank you!

Thanks,

Ryan

Using the Redriver IC TUSB216I , https://e2e.ti.com/support/interface-group/interface/f/interface-forum/1325293/faq-tusb216i-how-do-you-create-a-system-with-a-10-meter-passive-cable-using-a-usb2-redriver it is applied to a 10-meter-long USB 2.0 cable harness (with Redrivers added at both ends), the USB is powered by 5V and 500mA. Without an eye diagram testing device, how can we test the quality of USB signal transmission? And how to test the USB transmission rate (full speed)?

Hi Berry,

Berry LIn said:

Without an eye diagram testing device, how can we test the quality of USB signal transmission?

The only way to get an accurate representation of how the USB signal is affected by the redrivers is with an eye diagram. If you want, you can also use an oscilloscope to see how the voltage levels of the signal change with the redrivers enabled versus not enabled. Otherwise, there is no other way to signal quality.

Berry LIn said:

And how to test the USB transmission rate (full speed)?

Are you trying to test whether the USB connection maintains a consistent rate? Or are you trying to just see what the rate is at?

Our USB2 redrivers only cover HS signals, and not LS or FS. LS and FS signals will not be boosted by this redriver.

You can determine if it is HS or LS/FS by monitoring the CD and ENA_HS pins. If CD is high but ENA_HS is not, the signal is LS/FS. If both CD and ENA_HS are high, then it is a HS signal.

Thanks,

Ryan