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DS90UB960-Q1: Error Bit clarifications

David Shumate
Expert 7985 points
Part Number: DS90UB960-Q1

Hi Team,

During ESD testing my customer is seeing a few error flags get flipped on a 953/960 pair however they are not seeing any loss of video or video distortion so we're trying to understand how big of a concern this really is.

Here are the error bits we see flipped and some followup questions:

  1. FPD3_ENCODE_ERROR – Does this indicate errors occurred in the forward channel data? If we are not seeing any visual effects on the video do we really care that errors occurred?
  2. LINE_CNT_CHG – Does this indicate that we received a frame with a different number of lines than the previous frame for that camera?

Can you help me understand if these errors are indicating anything like that we lost a mipi packet or something?

Best,

David

  • +1
    TI__Guru** 108530 points

    Hello David,

    David Shumate said:
    FPD3_ENCODE_ERROR – Does this indicate errors occurred in the forward channel data? If we are not seeing any visual effects on the video do we really care that errors occurred?

    If there are encoder errors then there are errors with specific control type data used in FPD-Link and would not directly cause an error in any payload data, but would almost certainly be accompanied by parity errors.

    David Shumate said:
    LINE_CNT_CHG – Does this indicate that we received a frame with a different number of lines than the previous frame for that camera?

    Yes, this is correct.

    David Shumate said:
    Can you help me understand if these errors are indicating anything like that we lost a mipi packet or something?

    Line count change would indicate, as you stated, that you received a frame with a different number of lines than the previous frame for that camera. Which has two possibilities:

    1) The Image sensor has generated a frame with less number of lines, or

    2) one or more lines were lost during transmission, which means a lost CSI packet for every line lost.