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DS90UB954-Q1: Two channel TI954 with different fps

Shao Hui
Prodigy 20 points

Part Number: DS90UB954-Q1

Dear TI,

My system is two camera(A:MIPI RAW60fps, B:MIPI YUV30fps), to TI954, then output to LVDS bridge.

Can it work with the following options:

  1. 954 TX1 send A data and 954 TX2 send B data
  2. 954 TX1 send A+B data with VC-ID
  3. 954 TX1 sned A data, then set register to change to send B data, switch the A/B data through control register on time

As the A and B is in different fps and MIPI format, I am not sure whether 1/2/3 can work?

  • 0
    TI__Guru** 113680 points

    Hello,

     

    The team is out due to a public Holiday in the US. Responses will be delayed until Monday.

    Thank you for your patience

  • 0
    TI__Guru** 113680 points

    Hello Shao,

    Shao Hui said:
    954 TX1 send A data and 954 TX2 send B data

    This is not possible. TX1 and TX2 can send only replicated data.

    Shao Hui said:
    954 TX1 send A+B data with VC-ID

    Yes, you can re-assign a new VC-ID at each RX port and then output both data on the TX ports. Your SoC will know which data came from which camera based on the VC-ID number.

    Shao Hui said:
    954 TX1 sned A data, then set register to change to send B data, switch the A/B data through control register on time

    That is not possible since there is not enough memory to store more that 1.5 data lines.

  • 0 in reply to Hamzeh Jaradat
    Prodigy 20 points

    Dear Hamzeh, as the following items:

    1. 954 TX1 send A data and 954 TX2 send B data

    ------This is not possible. TX1 and TX2 can send only replicated data.

    OK, clear.

    2. 954 TX1 send A+B data with VC-ID

    ------Yes, you can re-assign a new VC-ID at each RX port and then output both data on the TX ports. Your SoC will know which data came from which camera based on the VC-ID number.

    How about if A is MIPI RAW, and B is MIPI YUV, is it still work in this case？

    3. 954 TX1 sned A data, then set register to change to send B data, switch the A/B data through control register on time
    ------That is not possible since there is not enough memory to store more that 1.5 data lines.
    Is memory means the bandwith, As we calculate the bandwith, data A is about 1.2Gbps, B is about 0.6Gbps, this solution is still NOK?
    Our original think is: A link to RX port0, B link to RX port1, and at the same time, Only one of RX port0 and RX port1 is enabled, another is disabled.
    Through control of 954 RX port, to realize the data switch.
  • 0 in reply to Shao Hui
    TI__Guru** 113680 points

    Hello Shao,

    Shao Hui said:
    How about if A is MIPI RAW, and B is MIPI YUV, is it still work in this case？

    Yes, that is also okay. each camera can send a different datarate, resolution and data type.

    Shao Hui said:
    Is memory means the bandwith, As we calculate the bandwith, data A is about 1.2Gbps, B is about 0.6Gbps, this solution is still NOK?
    Our original think is: A link to RX port0, B link to RX port1, and at the same time, Only one of RX port0 and RX port1 is enabled, another is disabled.
    Through control of 954 RX port, to realize the data switch.

    You can switch between A and B, but you need to be aware of the following:

    1) TX1 and TX2 will output the exact same data. There is no way to send alternative data on them. If you want to send each camera to one TX then you should use the DES UB960 instead of the UB954.

    2) You can't turn ON and OFF the TX ports. Either TX1 or both TX have to be running at the same time, but not TX2 alone.

  • 0 in reply to Hamzeh Jaradat
    Prodigy 20 points

    Dear Hamzeh,

    You can switch between A and B, but you need to be aware of the following:

    1) TX1 and TX2 will output the exact same data. There is no way to send alternative data on them. If you want to send each camera to one TX then you should use the DES UB960 instead of the UB954.

    2) You can't turn ON and OFF the TX ports. Either TX1 or both TX have to be running at the same time, but not TX2 alone.

    OK, thanks, we will choose only one TX channel in 954, the control is mainly on RX of 954. (For example: RX0 enable, RX1 disable / RX0 disable, RX1 enable; the TX channel will always be TX0)

  • 0 in reply to Shao Hui
    TI__Guru** 113680 points

    Hi Shao,

    Shao Hui said:
    we will choose only one TX channel in 954, the control is mainly on RX of 954. (For example: RX0 enable, RX1 disable / RX0 disable, RX1 enable; the TX channel will always be TX0)

    This is fine,