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DS90UB954-Q1: Error detection registers

Tomoaki Yoshida91
Genius 5255 points
Part Number: DS90UB954-Q1

Hi team,

I have some questions about error detection registers of 953 and 954.

#1 When ALARM function is enabled

 953.0x52[1]  GENERAL_STATUS.CRC_ERR

 954.0x51[4] SENSOR_STS_0.BCC_ALARM

I understand that if 953.0x52[1] will be cleated, 954.0x51[4] will be also cleared.

It is written that "This bit is cleared upon read of CRC ERR CLR register", but will 953.0x52[1]  and 954.0x51[4]  not be cleared when writing to 953.0x49[3] CRC ERR CLR register?

#2 When ALARM function is enabled

 Is the 954.0x51[3] LINK_DETECT_ALRAM set to the same value as 953.0x52[4] LINK_LOST_FLAG?

 In that case, will 954.0x51[3] and 953.0x52[4] be cleared if it is written to CRC ERR CLR?

#3

I understand that If 954.0x56 RX_PAR_ERR_LO is read, 0x4D[2] PARITY_ERROR, 0x55 and 0x56 are all cleared.

Is it correct?

Best regards,

Tomoaki Yoshida

  • 0
    TI__Expert 3055 points
    Hello,

    #1 These are cleared upon write to the CRC_ERR_CLR register.
    #2 Yes
    #3 Yes

    Regards,
    Zoe
  • 0 in reply to Zoe Nuyens
    Genius 5255 points
    Hi Zoe-san,

    Thank you for your support.
    I have a question about #2.

    Why are cleard 954.0x51[3] LINK_DETECT_ALRAM and 953.0x52[4] LINK_LOST_FLAG when CRC_ERR_CLR register is read?
    If 954.0x51[3] and 953.0x52[4] are cleared when CRC_ERR register is read and CRC ERROR is not generated, even though the cause of LINK LOST has not been resolved, will the user incorrectly recognize that the cause has been eliminated?

    Best regards,
    Tomoaki Yoshida
  • 0 in reply to Tomoaki Yoshida91
    TI__Expert 3055 points

    Hi Yoshida-san,

     

    It is recommended to read all registers affected by CRC_ERR_CLR before clearing it to avoid losing information. However, if the link has not been recovered, the LINK_LOST_FLAG will be set to 1 again after being cleared.

    Additionally, the changes in lock status may be monitored on the 954 via register 0x4D[4] which is independent of CRC_ERR_CLR.

     

    Regards,

    Zoe