Other Parts Discussed in Thread: TUSB212
Hello,
I've designed a PCB whose purpose is to redrive an USB2 HS signal. It is located at the front of a device.
The relevant parts of the schematic and routing are attached to this post. The USB traces are theoretically 90 ohms impedance matched.
The problem is:
First I've tried to test a very simple setup: the PCB with the TUSB211 is connected to a USB2 HS flash drive directly. There is about 1.5m of cable between the host and the PCB.
If I remove the power supply from the TUSB211, the USB flash drive works properly.
If I turn on the PSU, not matter what EQ level I select (and yes, I properly reset the chip each time I change this setting), the USB flash drive never enumerates.
I've tried with other devices, other cables, it is always worst with the TUSB211 turned on.
We do not own a very high speed oscilloscope nor the proper USB test fixture, so I can't measure the eye diagram.
Is something obvious missing?
Thanks in advance,
Victor
