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Original question:

DS90UB947-Q1: Errata DS90UB947-Q1

DS90UB947-Q1: CRC error detect

Amelie Zheng
Genius 10865 points
Part Number: DS90UB947-Q1

Hi Team,

When 947 works normal, it still can receive the following kind of CRC error. Will it have bad impact?

CRC error (read ti947 0x0A reg = 0x5.  read ti947 0x0C reg = 0x17, CRC error(s) detected.)

  • 0
    TI__Guru* 92000 points

    Hello Amelie,

    please make sure these CRC errors are not happening during power-up. To do this you need to clear CRC register counters by writing 1 to 0x04[5] and then write 0.

    After clearing the counters, you need to wait for some time and read reg 0x0C, 0x0A and 0x0B again and see if you still see new CRC errors.

    In general, having CRC errors is not recommended since it can cause failing I2C communication or and BCC communications.

  • 0 in reply to Hamzeh Jaradat
    TI__Genius 10865 points

    Thanks for your reply.

    Do we have any method to test whether the data are transferred correctly or not? such as error rate?

    Thanks!

  • 0 in reply to Amelie Zheng
    TI__Guru* 92000 points

    Hello Amilie,

    before normal operation you can run the BIST test for few minutes/hours. At the end you can see if the link quality is good enough showing no errors (for more details see the d/s)

    During normal operation you can monitor the error regisers mentioned by you. For more details check the UH948 or UH947 d/s section "7.3.15.2".

    Also you can monitor the PASS pin as error indicator.