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TUSB2077A: USB Re-Driver for upstream and downstream port

Duoc Nguyen
Prodigy 10 points
Part Number: TUSB2077A

Tool/software:

Hi TI,

I use 3 USB HUBs and config as image attached.

The downstream port quiet long distance with include PCB trace length + USB cable to end device.

So, I have two questions:

1. How long for USB trace length + USB cable length that we need to add USB Re-Driver if use with TUSB2077A.

2. Can I just use one USB Re-Driver on upstream of USB HUB (  the red circle ) to boost for all downstream ports of HUB?

Thanks,

Nguyen