DS90UB953-Q1: CSI-2 clock input

Hi Hamzeh,

Thanks for your response. Let me check it as you reply. I will ask you more questions if this issue is not cleared.

Regards,

Hi Hamzeh,

My customer tested on DS90UB953/954-Q1 as you told me. But there was a same issue. So I'd like to request the review of register setting. Please check an attached file below.

DSUB953_954_Register setting.pdf

Regards,

Hello Jeffrey,

I have reviewed your settings, and here is my findings:

0x42 is default, no need to write
0x41 - change to = 0xA9
--- write at the end, after configuring the Serializer and Sensor ---
0x33=0x01
0x21=0x04
0x20=0x20

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But I am really confused now! Can you summerise your issue again?

I understood the following, correct me if I am wrong.

When you use continous clock in the Image sensor, the system is working. But once you use non-continous CLK in the image sensor, the system is not working, correct?

Hi Hamzeh,

I answered your question below.

When you use continous clock in the Image sensor, the system is working. But once you use non-continous CLK in the image sensor, the system is not working, correct? Yes. it is correct.

My customer tested again on DS90UB953/954-Q1 as you reviewed the settings. But MIPI CSI-2 data/clock was not output when they used the non-continuous clock mode only in their image sensor. Is MLX75026(Image sensor of MELEXIS) compatible with DS90UB954? Please refer to the attached file(MIPI CSI-2 clock waveform of image sensor) below.

MIPI CSI-2 clock of sensor.pdf

Regards,

Hello Jeffrey,

Are you changing the CSI CLK mode during run time? You need to stop the SER, change the Input CLK mode and the enable SER again.

Also, I recommend checking registers 0x5C and 0x5D in the 953 to see if the mismatch is causing any CSI errors to occur. In the case that errors are occurring I would say that it is not going to work long term

HI Hamzeh,

Thanks for your kind response. There are two test configurations in attached file below. My customer wants to use the configuration of case #2. Is it possible or not? Please let me know it. if not, could you recommend other SerDes solutions?

MIPI CSI-2 clock of sensor and test configuration.pdf

Regards,

Hi Hamzeh,

I'd like to ask you one more question about this case. My customer confirmed the proper working of both cases after testing. But there is the difference between 953 input clock and 954 output clock like the attached file below. Is it correct? Also, Can 953 input clock pass through 954 as the same clock waveform? Because they want to use the same clock of 953 input clock on the MIPI interface of their CPU.

953 input clock and 954 output clock.pdf

Regards,

Hi Hamzeh,

Your answer will help me and them to clarify this issue. Thanks.

Regards,