• State
  • Locked Locked
  • Replies 3 replies
  • Subscribers 32 subscribers
  • Views 179 views
  • Users 0 members are here
Support feedback
Options
Options
Similar topics

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

Original question:

DS90UB936-Q1: About changing AEQ searching range

DS90UB936-Q1: About Lock status

Chris Liu
Prodigy 210 points
Part Number: DS90UB936-Q1

Hi,

Recently, I got some logs from some fielded devices. 

The logs show that the lock status (0x4D[0]) was changed to 0 from 1 and changed to 1 in a very short time.

The register reading is triggered by GPIO3/INTB. Please see the following logs, the value in the brackets[] is in seconds:

2023-03-15T09:38:18.659823-05:00 kernel: [ 839.914369] ds90ub954 2-0030: rx0: NOT LOCKED
2023-03-15T09:38:18.663845-05:00 kernel: [ 839.917600] ds90ub954 2-0030: rx0: LOCKED
2023-03-15T09:38:36.383821-05:00 kernel: [ 857.637384] ds90ub954 2-0030: rx0: NOT LOCKED
2023-03-15T09:38:36.387848-05:00 kernel: [ 857.640330] ds90ub954 2-0030: rx0: LOCKED
2023-03-15T09:40:15.231825-05:00 kernel: [ 956.484223] ds90ub954 2-0030: rx0: NOT LOCKED
2023-03-15T09:40:15.236126-05:00 kernel: [ 956.487832] ds90ub954 2-0030: rx0: LOCKED
2023-03-15T09:40:28.184029-05:00 kernel: [ 969.437112] ds90ub954 2-0030: rx0: NOT LOCKED
2023-03-15T09:40:28.187829-05:00 kernel: [ 969.440443] ds90ub954 2-0030: rx0: LOCKED
2023-03-15T09:40:33.647832-05:00 kernel: [ 974.897651] ds90ub954 2-0030: rx0: NOT LOCKED
2023-03-15T09:40:33.647845-05:00 kernel: [ 974.901067] ds90ub954 2-0030: rx0: LOCKED
2023-03-15T09:40:34.947852-05:00 kernel: [ 976.199564] ds90ub954 2-0030: rx0: NOT LOCKED
2023-03-15T09:40:34.951831-05:00 kernel: [ 976.203683] ds90ub954 2-0030: rx0: LOCKED
2023-03-15T09:40:34.983827-05:00 kernel: [ 976.236640] ds90ub954 2-0030: rx0: NOT LOCKED
2023-03-15T09:40:34.987820-05:00 kernel: [ 976.240530] ds90ub954 2-0030: rx0: LOCKED
2023-03-15T09:40:35.195880-05:00 kernel: [ 976.446342] ds90ub954 2-0030: rx0: NOT LOCKED
2023-03-15T09:40:35.199835-05:00 kernel: [ 976.449555] ds90ub954 2-0030: rx0: LOCKED

We think it's because the quality of FPD-Link is not good, but we don't have any strategy to solve that.

The device worked well before this happened.

Could you help to give the possible reasons for the sympton?

Any suggestion is appreciated.

Thanks.

  • 0
    TI__Genius 10630 points

    Hello,

    Thank you for your inquiry.

    Can you also collect the following registers 0x4D,0x4E,0x55,0x56,0x7A,0x7B? Also, have you tried completing MAP analysis to see if the link status?

    FPD-Link Margin Analysis Program (MAP) user's guide (ti.com)

    Some clarification questions:

    1. Is this isolated to one or multiple systems?
    2. Is this repeatable at every power up? 
    3. Have you tried different cable, Ser, and Des configuration? 

    Glenn 

  • 0 in reply to Glenn Uranga
    Prodigy 210 points

    Hi Glenn,

    Thanks for your quick reply.

    Since the sympton can't be reproduced in lab, it only occurs on fielded devices, I'll request customer to do the MAP once the sympton occurs.

    I'll also try to modify my code to collect the register info.

    To answer your question:

    1. It happens on multiple fielded devices.

    2. not sure.

    3. Yes, but it seems it doesn't help.

  • 0 in reply to Chris Liu
    TI__Genius 10630 points

    Hi Chris,

    If this is hard to reproduce. Let's get a full register dump of all registers then. That way we don't have to keep going back and forth. Provide the register in a good state and failing state. 

    Glenn