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Original question:

DS90UB934-Q1: 934 lost lock time

DS90UB933-Q1: why do we have slaveID in 933 register map

Elec Cheng
Expert 7055 points
Part Number: DS90UB933-Q1

Hi Expert,

I see below register in 933 map. Why do we have slaveID in 933 register map? Is seems to use for slave attached to remote Des. Under what occasion will we use it? Thanks.

BR,

Elec Cheng

  • 0
    TI__Guru** 103215 points

    Hello Elec,

    You are correct. These registers are used for communication in the reverse direction if there is an I2C controller device located on the 933 side. For example there could be an MCU or SoC located physically on the 933 side which wants to communicate with a remote target MCU, sensor, etc. that is on the DES side. In which can these registers would be used to set up the passthrough 

    Best Regards,

    Casey 

  • 0 in reply to Casey McCrea
    TI__Expert 7055 points

    Hi Casey,

    Thanks for reply. But from my understanding, there should be only one master on the I2C path. If there is another I2C controller located on 933 side, what about the I2C controller located on DES side. Or there is non I2C controller on DES side? Thanks.

    BR,

    Elec Cheng

  • 0 in reply to Elec Cheng
    TI__Guru** 103215 points

    Hello Elec,

    There is nothing from the FPD-Link device perspective preventing a controller device from being on either side or both. The FPD-Link devices have WDT blocks to prevent each side from trying to act as a controller if the bus is already busy so technically it is possible to implement a controller on both sides. But practically speaking the customer would want to coordinate the two controllers to make sure they do not try to communicate at the same time. 

    Generally the most common for ADAS applications is that the controller is located on the DES side and there is no controller on the SER side. For IVI applications it is most commonly the other way around. But from the FPD-Link devices perspective either direction is possible or both in the same application. 

    Best Regards,

    Casey 

  • 0 in reply to Casey McCrea
    TI__Expert 7055 points

    Hi Casey,

    Thanks for reply!

    BR,

    Elec Cheng