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TUSB522P: TUSB522P EVM

bin lin
Prodigy 20 points
Part Number: TUSB522P

Hi,

I purchased TUSB522P EVM. It works fine with USB port on a laptop. would like to test our USB3.0 cable with BERT Scope BSA286CL.  I can't get the output through the EVM. Below is the block diagram I have for the test. the input signal is 500mv Vp-p, 5Gbps. 5V power is provided to the EVM from an external power supply. questions:

1. is this test setup correct?

2. it doesn't handshaking process to work does it?

3. looking for your recommendation and suggestions.

thanks

bin

  • 0
    Prodigy 20 points

    resending the picture

  • 0 in reply to bin lin
    TI__Mastermind 22075 points

    Hi Bin,

    bin lin said:
    1. is this test setup correct?

    The setup looks correct

    bin lin said:
    2. it doesn't handshaking process to work does it?

    The 522P doesn't require handshaking as it is only passing the USB signal through. It does require both TX lanes to be terminated with 50ohm terminations for RX detect.

    bin lin said:
    3. looking for your recommendation and suggestions.

    1. How do you supply the 5V from the power supply to the EVM? If you're using J11, this is a 3.3V rail.

    2. Make sure that both TX1 and TX2 are terminated with 50Ohm terminations. The 522P will not activate unless it sees terminations on both sides.

    Best,

    Shane

  • 0 in reply to Shane Hauser
    Prodigy 20 points

    Thanks, Shane.

    I'm not sure how the bertscope is terminated. i can terminate our SI test board with 100ohm between TX1n and TX1p. would this be ok? please the picture below. this is the easiest way I can think of.

  • +1 in reply to bin lin
    TI__Mastermind 22075 points

    Hi Bin,

    I made a diagram of your system to help show what needs to be terminated. Please correct me if I've misunderstood the setup:

    I don't believe terminating TX on the SI test board will activate the 522P. This is because SSTX on the test board will route to SSRX on the 522P EVM side through the USB cable between them. USB cables route the TX lines to RX on the other side to create a flow-through signal path.

    What you would want to terminate is SSRX on the board opposite the 522P from your SI test board. This is because the TX on the 522P will route to SSRX on the connected board.

    I would check to see if this works first. If not, you may want to check the terminations on your BERT as well. The 522P looks for 90 ohm differential termination or 50 ohm single ended terminations.

    Let me know if you have any questions.

    Best,

    Shane

  • 0 in reply to bin lin
    Prodigy 20 points

    Thanks, Shane.

    the issue is resolved.