DS90UB954-Q1: Question regarding interface between SOC and deserializer, concerning MCLK( Master clock pin) of camera/SOC.

Hello,

Just to clarify, are you asking if you can use a clock source output from the SoC?  It should be okay to use the SoC as a source to the REFCLK pin, as long as the clock frequency is within the recommended values given in the datasheet.  The clock frequency can then be derived on the serializer side from the back channel rate.  Section 7.4.1.5 in the 953 datasheet gives an explanation on how to configure the frequency of the CLK_OUT pin to work with your system.

Regards,

Nick

Yes. If soc can generate the frequency that fall into the IC's  range,  then can we connect MCLK to the ref clk pin? If it is less than that, then what should we do with the soc MCLK pin? Can we let it float? won't it affect the soc side when it is receiving data? It will be very helpful if you can give any suggestions regarding this.

Thanks

So yes if the clock generated from the MCLK pin on the SoC falls within the specifications in the datasheet of the 954 then it is fine to use for the REFCLK.  Now if it doesn't then you can use an external oscillator or the internal AON clock.  As for what to do with the SoC pin I cannot say, the datasheet should be able to provide more information on what to do with it when not in use.

Can you clarify what you mean by receiving data? If you are referring to CSI data and I2C data then no it shouldn't affect it.  CSI has a dedicated clock lane, and I2C also provides a dedicated clock.

Regards,

Nick

Hi!

Thanks for the reply. Yes, I am receiving the CSI data from the serializer DS90UB953A-Q1 serializer. I will try with an external oscillator since the datasheet of the quectel SC66 does not specify the output frequency of the MCLK pin.

Thank you.

Nithish