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DS90UB936-Q1: Error Handling

Jared Becker
Genius 11845 points
Part Number: DS90UB936-Q1

Hi Team,

In section 7.5.9 of the 936 datasheet, the section reads "When the DS90UB936-Q1 detects an error condition the standard operation would be to flag this error condition and truncate sending the CSI-2 frame to avoid sending corrupted data downstream. When the DS90UB936-Q1 recovers from an error condition, it will provide Start of Frame and resume sending valid data."

However, the default settings in register 0x7C and 0x7D do not take any action if an error is detected, a user would need to set those. So when the above statement refers to "standard" operation, that is meaning that a user should go in and a change the registers in 0x7C and 0x7D to meet "standard" operation, correct?

Thank you,

Jared

  • 0
    TI__Mastermind 28680 points

    Hi Jared,

    The paragraph in section 7.5.9 is correct. However, there is a typo in the register table for 0x7C. By default, 0x7C[5] is actually set to 1 and the rest of the bits are set to 0. As a result, the DISCARD_ON_PAR_ERR is on by default and matches the language in the section. The user does not need to go in and manually change registers 0x7C and 0x7D each time to meet this "standard" operation.

    Best,

    Justin Phan

  • 0 in reply to Justin Phan
    TI__Genius 11845 points

    Hi Justin,

    Thanks for the information. Is there a plan to update this on the public datasheet? Also, what is the definition of Parity Error in this case? What would cause a Parity Error?

    Thank you,

    Jared

  • 0 in reply to Jared Becker
    TI__Mastermind 28680 points

    Hi Jared,

    We are planning to implement this correction, but do not have a specific timeline yet for when it will be available.

    And the definition of Parity Error is typically errors that occur in the Forward Channel (involving the transmission of video data from SER to DES). It can be caused by electromagnetic or environmental influences, which can change the data being transmitted over the cable link.

    Section "7.4.11.1 RX Parity Status" in the 936 datasheet talks a bit about the FPD-Link III receiver data parity in the Forward Channel Frame.

    Best,

    Justin Phan