TUSB522P: TUSB522PIRGER

Hi,

1. Can you show a block diagram of where the TUSB522P is located in the signal path? I see the EQ/DE configuration, but without knowing the loss of the TX and RX channels I cannot tell whether these are correct or not.

2. Has this port passed USB3 TX and RX compliance?

Best,

Shane

1.BY THIS TUSB522P: Inquiry about TUSB522P Configuration - Interface forum - Interface - TI E2E support forums , PCBA is finish and room temperature testing is passed
2.is passed.

I have a few more questions to get a better idea of the issue:

1. How often do you see this issue? (every device or only some)

2. Has the port passed TX and RX compliance at -40C?

3. Can you provide a protocol trace of the USB connection when you see the failure? It would also be good to see a protocol trace of your port when it is working correctly for comparison.

Best,

Shane

Apologies, let me rephrase.
At room temperature, after adding the redriver, the compliance test can now pass. However, with a cable length of about 2 meters, USB is often not detected.

In the previous version, without the redriver, the compliance test could not pass, but there was no issue with detection even with a 2-meter cable.

Currently, we suspect it might be a configuration issue. Do you have any suggestions for possible modifications?

Thank you for clarifying. You can try setting DE1 to the low setting (0dB). Its possible the de-emphasis + cable length is reducing your signal swing too much to recognize devices.

If that doesn't fix it, you could try changing EQ2 to Floating. This would help compensate any loss coming from the 2M cable.

I also recommend trying a few different USB cables. If the port passes TX and RX compliance, then it should support cables that fall within the -7.5 dB USB loss budget spec.

Best,

Shane

HI Snane

Using same 2M Cable.

After setting DE1 to 0, the USB functions normally at room temperature and low temperatures(-40 C) . However, at high temperatures(80 C), USB disconnection issues occur. Do you recommend setting EQ2 to FLOATING?

poyuan