• State Resolved
  • Locked Locked
  • Replies 2 replies
  • Answers 1 answer
  • Subscribers 33 subscribers
  • Views 1492 views
  • Users 0 members are here
Support feedback
Options
Options
Related

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.

DS90UB927Q-Q1: BIST Mode and "DES Error"(0x0C[1])

Kenichiro
Mastermind 9165 points
Part Number: DS90UB927Q-Q1

[ DS90UB927-Q1 & DS90UB928-Q1 ] BIST Mode and "DES Error"(0x0C[1])

Hi,

<Q1>:

Can you please elaborate "DES Error"(0x0C[1]) of DS90UB927?



The description says that "CRC error during BIST...". As my understanding, CRC is used for the BIST of back-channel communication.
However, we have another bit to indicate "BIST CRC Error". What is the difference?

Are there any relation to 0x03[7] "Back Channel CRC Checker Enable" bit?



<Q2>:

Is it the possible case that this "DES Error" is triggered without UB927 and UB928 going to BIST mode?


<Q3>:

The drawing below expresses my understanding of BIST report. Correct?




Thanks,
Ken

<Related Posts>:

[ DS90UB927-Q1 & DS90UB928-Q1 ] BIST Related Questions

e2e.ti.com/.../2456798

  • 0
    TI__Expert 8165 points
    Hello-

    A1: DES Error"(0x0C[1]) of DS90UB927 is set when there is an error on the back-channel during normal operation. It is an output of the back-channel CRC checker. The back-channel CRC checker is enabled with the register bit 0x03[7]=1 (default). The word "BIST" needs to be removed from the description.

    A2: Yes. DES Error may only be set during normal operation (not in BIST mode).

    A3: Yes.

    Regards,
    Davor
  • 0 in reply to Davor Glisic
    Mastermind 9165 points

    Hi Davor,

    Thank you for confirmation!
    I will consult with my customer based on the input from you.

    Hope datasheet will be corrected shortly.

    Thanks,
    Ken