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DS90UB927Q-Q1: SerDes from the HUD side

Daria Kiseleva
Intellectual 2645 points
Part Number: DS90UB927Q-Q1
Other Parts Discussed in Thread: DS90UB928Q

Good day, colleagues,

I have a question from the customer:

we have a serializer DS90UB927Q an a deserializer DS90UB928Q to connect a Head-Up-Display with a base system. I try to configure the SerDes from the HUD side. I can’t configure the SerDes to pass only specific I2C addresses, but for example a configuration to pass all I2C traffic from the base system to the HUD is working. However, local writing the configuration for address-filtering from the base system works. What do I need to do, to configure the SerDes from the HUD side to pass only specific addresses from the base system to the HUD?

Thanks,

Daria

  • 0
    TI__Guru** 103215 points

    Daria,

    When you program the I2C passthrough aliasing from the HUD side, are you programming the 927 registers or the 928 registers? If you are trying to configure passthrough from 927->928 then it needs to be programmed into the 927 registers. Can you share what you are programming?

    Best Regards,

    Casey 

  • 0 in reply to Casey McCrea
    TI__Intellectual 2645 points

    Hi Casey,

    In the first step, I write the 928 deserializer register from HUD side:

    I2C Control 1                0x05:    0x9E //pass all i2c on hud side to base system to be able to config serializer

     

    In the second step, I write to the 927 serializer from HUD side:

     

    General Configuration   0x03:    0xDA //pass through matching aliases from base system to hud

    Slave ID1                     0x70:    0xCC //hud mcu i2c slave adr

    Slave Alias 1                0x77:    0xCC

    Slave ID0                     0x07:    0x58 //hud sensor i2c adr

    Slave Alias 0:               0x08:    0x58

    Thanks,

    Daria

  • 0 in reply to Daria Kiseleva
    TI__Guru** 103215 points

    Daria,

    Are you able to read back the registers that you programmed remotely to the 927 to see if the expected values are returned?

    Best Regards,

    Casey 

  • 0 in reply to Casey McCrea
    TI__Intellectual 2645 points

    Hi Casey,

    the slave ID and alias registers return the expected results. Unfortunately, the general configuration register 0x03 returns the default value 0xD2.

    Thanks,

    Daria

  • 0 in reply to Daria Kiseleva
    TI__Guru** 103215 points

    Daria,

    I confirmed that 0x03[3] in the 927 can only be set via the local I2C interface. It can not be controlled via BCC communication from the deserializer side

    Best Regards,

    Casey