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TS5MP645: Switching between two different interfaces

Jejomar Ildefonso
Expert 8590 points
Part Number: TS5MP645
Other Parts Discussed in Thread: TMUX1574

Hi Team,

Posting on behalf of our customer. They are considering to use the TS5MP645 for an application that requires 2 cameras, one MIPI interface and one with a Camera Link interface. Will the the TS5MP645 be able to switch those interfaces since they are different? Do we have a reference design that can be shared?


Thanks in advance!


Kind Regards,

Jejomar

  • 0
    TI__Mastermind 43295 points

    Hi Jejomar,

    The TS5MP645 is designed for MIPI because it is high bandwidth (Min: 1.5GHz) , has low on state resistance, and it supports 4 Input MIPI lanes + 2 clock signals. However besides the specifications being favorable to a MIPI application this is still a passive FET switch and if the signals being passed through the device follow the recommended guidelines of the device there shouldn't be an issue.

    I am not as familiar with Camera Serial Interface - however I am pretty sure that it uses LVDS - which the TS5MP645 will be able to handle the signal levels. However there is a limit of 1.5 GHz of bandwidth per channel and putting signals above that limit through any one channel could cause signal degradation, however you can get higher data throughput because of the multiple inputs the device allows. Also how many required data pathways are there? - from what I can tell there is a possibility of more than 5 lanes of data/clock/control - this may require a multi-chip solution if switching MIPI is also required - please let me know so I can see what is the best solution for the application is!

    Best,

    Parker Dodson

  • 0 in reply to Parker Dodson
    TI__Expert 8590 points

    Hi Parker,

    Thank you very much for these helpful information. Just to clarify, you indicate the TS5MP645 has minimum bandwidth of 1.5GHz and the Camera Link interface has a maximum bandwidth for 1.5Ghz. Is our understanding correct? We haven't been able to find the Camera Link spec for bandwidth in terms of frequency, only Gbps.


    Kind Regards,

    Jejomar

  • 0 in reply to Jejomar Ildefonso
    TI__Mastermind 43295 points

    Hi Jejomar,

    There is a slight problem with datarate to bandwidth relation because it changes depending on what choices were made when defining it. Sometimes datarate = bandwidth - other times bandwidth needs to exceed datarate by 2 to 3 times - it just depends how everything is running. For this part you should be able to run ~1.5Gbps per channel as a lot of our higher frequency switches typically handle datarates up to their bandwidth, but this doesn't always hold true in all applications as parasitics and other components on the output of the switch can also degrade bandwidth. 

    Camera Serial interface 2 on D-PHY for example has a max of 2.5Gbps/ lane and for this switch you may start to lose data due to bandwidth limitations of 1.5G that the MIPI switch provides. If that 2.5Gbps/ lane is necessary for your application we do have faster 2:1 switches - but they have a lower channel count so it would require multiple chips but you will most likely have less problems due to bandwidth. The TMUX1574 is a 4 channel (2 lane) 2:1 switch that has a nominal bandwidth of 2GHz, but we have tested and have eye diagrams for up to 2.4 Gbps - so this is going to be a faster part if the speed is necessary.

    Please let me know if you have any other questions!

    Best,

    Parker