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DS90UB948-Q1: INTB_IN signal

Yuto Kitamura
Expert 5690 points
Part Number: DS90UB948-Q1

Dear team,

Q1: Do we need falling edge to detect INT signal Low?
Q2: If Q1 is yes and INTB remains low after power up. Doesn't this IC detect INTB low?

Thank you.
Yuto Kitamura

  • 0
    TI__Guru 65740 points

    Hi Kitamura-san, 

    INTB is falling edge detection. 

    I will confirm on HW if IC is able to initially detect INTB low, I'll confirm in 1-2 days. 

    Regards, 

    Logan

  • 0 in reply to Logan Cummins
    TI__Expert 5690 points

    Hi Logan,

    Thank you, please provide the answer once you get any updates.

    Yuto Kitamura

  • 0 in reply to Yuto Kitamura
    TI__Guru 65740 points

    Yuta-san, 

    I tested this, RX_REM_INT is always asserted on start-up anyways as a transient, so it will always have the host controller initially try to service downstream device, regardless of whether it was initially held low on device PDB. 

    Also, as mentioned before, INTB is falling edge detection, so after the initial interrupt clear on start-up/PDB release - interrupt will not re-assert until next falling edge. 

    Regards, 

    Logan