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TXG8042-Q1: RMII, MDC, MDIO isolation

Shinji Tsuji
Genius 14139 points
Part Number: TXG8042-Q1
Other Parts Discussed in Thread: TXG8042, TXG8122

Tool/software:

Hi team,

I would like to separate GND from SoC and 100Baset-T1 PHY IC for RMII and MDC/MDIO interface line. 

I found TXG8042-Q1 (automotive Q100 is mandatory), but it only support full duplex I/O and which could not support MDIO.

Could you please advise your recommended configuration to separate GND of RMII and MDC/MDIO signal? 

regards,

  • 0
    TI__Prodigy 20 points

    Hello, 

    Currently TXG8042 is for CMOS push pull devices for SPI/UART. We also have TXG8122 which is for open-drain applications but specifically for I2C. We do not have anything specifically for RMII/MDC/MDIO signal at this time. 
     
    Is there a ground potential difference between the SoC and the PHY IC? 

    Thanks,

    Sadia

  • 0 in reply to Sadia Khan
    TI__Genius 14139 points

    Hi Sadia-san,

    Yes, there is a ground potential difference between SoC and PHY. 
    It seems it can be used for RMII signal, but there is a challenge in MDIO, is my understanding correct?

    is there recommended devices in isolation interface portfolio?

    regards,

  • +1 in reply to Shinji Tsuji
    TI__Mastermind 40656 points

    Hi Tsuji-san,

    I see that you have sent an email out regarding this concern- let me close the thread and we will follow up via email.

    Thanks,

    Jack