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DS90UB635-Q1: DS90UB635-Q1: Question:if it is possible that FPDLINK can convert to GMSL?

Part Number: DS90UB635-Q1
Other Parts Discussed in Thread: TDA4VH

Tool/software:

Hi Ti Team:

I have a question about if it is possible that FPDLINK can convert to GMSL?

Background: The current ADS domain Deserializer is MAX96722, while the serializer of the customer's camera at some stage is Ti DS90UB635
Question: Is there a simple way (without ISP SOC) to connect the camera to the ADS domain controller for image data acquisition?
Feasibility: Since MIPI is a standard protocol interface, is it possible to make a transfer board (light green) as follows, to connect Ti de-serializer to Maxim serializer directly, to achieve FPDLINK and GMSL2.0 inter conversion?
Concerns:
Solution 1: For deserializer and serializer In the initial stage of link, the back channel has some configuration, if it is not using a vendor's product, this layer should have a barrier to link? So it won't link to lock? So shouldn't it be feasible?
Solution 2: Should MIPI forwarding through ISP SOC be able to achieve the goal of interface switching?

  • Hi,

    Thanks for this question. To convert between GMSL and FPD-Link there would need to be a link through a MIPI interface such as you've shown in the diagrams. For devices such as the UB935 and UB638, link will come up without any configuration. We will need to do some configuration of the ser/des. but there should be options for pass through from the downstream SOC to the upstream serializer.

    Best,

    Thomas

    Best,

    Thomas

  • Hi Thomas,

    Thanks a lot for your answer!

    You said:To convert between GMSL and FPD-Link there would need to be a link through a MIPI interface such as you've shown in the diagrams.

    It means we must use a SOC for MIPI interface like showns in solution2?

    For some reasons,solution2 must be the 100% available solution.

    If we want to a simple solution, how do you think the solutio3 what without ISP SOC for MIPI, but just the MCU for Deserializer configrations?

    Thanks,

    Kai

  • Hi Kai,

    Solution 3 would work well here too, the CSI-2 TX and CSI-2 RX will both be compliant with the applicable MIPI specifications and there shouldn't be issues with interoperability. The downstream SOC could also likely do the configuration of all of the SER/DES within the video path here. We're not experts in the GMSL SER/DES but I'd presume that there's an option for I2C pass through to various targets - in our case these could be the FPD-Link devices upstream.

    Best,

    Thomas

  • Thanks,Thomas!

    We have R&D on THA4VH and AM62,would you please recommend another suitable and simple SOC for this convert solution?

    Maybe just two mipi CSI is enough,even do not need Auto grade SOC.

    Thanks,

    Kai

  • Hi Kai,

    Is this an ISP SOC which you're looking for here? Is there a particular reason you're looking to post process this image in the middle of the video path rather than passing MIPI data from FPD DES to GMSL SER such as in solution 3 above?

    Best,

    Thomas

  • Hi Thomas,

    1,I want to design solution2/3 both in one board,because soution2 have not been verified before,but solution3 will be work 100%.

    2,we have R&D experience on Ti ISP like AM62 and TDA4VH, but TDA4VH seems over design for this case, and AM62 seems lack of one MIPI interface, so I want to ask you if any available  Ti ISP can be used.

    Thanks,

    Kai

  • Please see below HW diagram for reference.

  • Hi Cheng,

    Thanks for your question. Understand now your point - let me ask my team if we're aware of any ISP which could be used here. 

    Best,

    Thomas

  • Hi Cheng,

    One more question - do you know why solution 3 is viewed as middle risk here? It seems this could be implemented without significant issue.

    Best,

    Thomas

  • Hi Thomas:

    Thanks for your feedback.

    Solution 3 is viewed as middle risk because this solution have not been verified by us before,compared with the solution2 which must be avialable.

    Thanks,

    Kai

  • Hi Cheng,

    Let me check with EP team if we have some ISP which would work well here. Are the only needs to have a CSI-2 RX and CSI-2 TX? Would this converter board be powered over PoC or have a direct power source? If there's any other requirements on ISP that would be great to know.

    Side note - solution 3 should still be low risk. FPD-Link device has MIPI DPHY compliant transmitter - with MIPI DPHY compliant receiver on MAX device.

    From DS90UB638 Datasheet:

    From MAX96717 datasheet:

    Best,

    Thomas

  • Hi Thomas:

    So from your aspect,as the UB938 and MAX96717 MIPI CSI-2 protocal is the same,so we can say the solution 3 is also low risk.

    The ISP SOC I am looking for likes TDA4 series in below picture,as I said we have the design experice in TDA4VH and AM62.

    so the low cost TDA4 and the same as AM62 but has 1 CSI TX and 1CSI RX with fewer inferfaces will be better.

    Thanks.

    Kai