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DS90UB964-Q1: DS90UB964 rear view camera analysis continue(2)

Part Number: DS90UB964-Q1

dear cindy

Hi Raymond,

Thank you for the clarification on the schematic.

I noticed in the register configs that you have continuous clock mode turned off in register 0x33. For debugging purposes, can you try enabling continuous clock mode and then measure the CSI clock output on the scope to see if it is still drifting in frequency? 

For the register dump of the issue unit (bad.txt), what do you mean by "the failed machine reads at the time of replay?" Were these registers read when the CSI clock reached the high frequency and the screen went black?

Are these units tested over temperature, or were these measurements taken at room temp?  

Regards,

Cindy

-------------------reply to this topic 

As something wrong with E2E paltform display,reply as below

1. Try changing the value of register 0x33 to 0x03 and turn on continous clock mode.

2. Bad Txt inside the value of the CSI clock frequency is high, the video screen black when the export of

3, the test is carried out at room temperature

  • Hi Raymond,

    1. Try changing the value of register 0x33 to 0x03 and turn on continous clock mode.

    When you turned on continuous clock mode did you still see the same frequency issue?

    Can you clarify the following from the report:

    • The abnormal CSI clock and black screen issue is only happening in 36/2000 964 units?
    • For a normal unit with 200Mhz CSI clock, this issue never happens?
    • What are the results of the ABA cross validation? The report does not make this clear.

    Can you try enabling the pattern generator and CSI-2 forwarding in the 964 and see if the issue still happens? You can refer to 8.5.6 in the datasheet for more information. Using patgen will allow for isolated verification of the CSI-2 transmitter.

    Regards,

    Cindy