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TUSB1210: Not detected by HOST

Katsu Matsunaga
Expert 7730 points
Part Number: TUSB1210

Hello,

On the target board, some board shows an error of Not device detection by HOST sometime. In case of the error, strange D+ pin behavior was observed. In normal case, D+ went to high at end of BISO enumeration and went down to GND at OS starting. However D+ got GND level at end of BIOS enumeration. 

Have you seen the phenomenon before?

Could you please give any advice? 

Normal operation 

Not device detection error

Thanks and best regards,

Katsu

  • 0
    TI__Guru 60865 points

    Hello Katsu,

    The passing case shows a bus reset occurring between BIOS and OS, the failing case appears to show that the bus is suspending but not reset between BIOS and OS.  Can you provide zoomed in scope shots of the behavior when DP goes to 3.3V on the passing case and what occurs at the end of hs traffic in the failing case?

    Thanks,

    JMMN

  • 0 in reply to JMMN
    TI__Expert 7730 points

    Hi,

    Thank you for your reply.

    Here is zoomed scope shot. That has a strange phenomenon during chirm K and J.

    Ch1: DP (yellow) Ch 2: DM (Green)

    It seems that the HS termination is turned off and low level of PM goes up. I think this is unexpected behavior but this has been observed both OK and NG.

    What is happen? Is this effect to this problem?

    Best regards,

    Katsu

  • 0 in reply to Katsu Matsunaga
    TI__Guru 60865 points

    Hello Katsu,

    It looks like the device is sending two chirp Ks?  The TUSB1210 would only do this if the link sends the commands to generate another Device ChirpK event.  It seems like it doesn't impact the high speed handshake result.  Can you send a zoomed in plot of the failing case?

    Thanks,

    JMMN

  • 0 in reply to JMMN
    TI__Expert 7730 points

    Hi JMMN-san,

    Thank you for your comment.

    in case of failing, zoomed plot is here

    Ch.3: DP, Ch4: PM


    Anyway, I understand that this behavior doesn't affect to this system failing. I will ask my customer to try to find any other difference between pass and fail

    Best regards,

    Katsu

  • 0 in reply to Katsu Matsunaga
    TI__Guru 60865 points

    Hello Katsu,

    The HS handshake is odd, but successful.  Can the customer send a zoomed in scope plot on the originally identified failing area?

    Regards,

    JMMN

  • 0 in reply to JMMN
    TI__Expert 7730 points

    Hi JMMN-san,

    Here is scope of NG case. scope shot is attached below too.

    Do you have any on this waveforms? 

    below is good case.

    Best regards,

    Katsu

  • 0 in reply to Katsu Matsunaga
    TI__Guru 60865 points

    Hi Katsu,

    The NG vase shows a clear device disconnect - you can see the last uSOF from the host doubles in amplitude which is the sign that the device is no longer on the bus.  Is it possible that there is a VBUS toggle or similar event that could cause the disconnect?

    Regards,

    JMMN