DS90UB948-Q1: INTB_IN signal

Yuto Kitamura

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

9 months ago

0 Logan Cummins 9 months ago

TI__Guru 63270 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 Yuto Kitamura 9 months ago in reply to Logan Cummins

TI__Expert 5100 points

Hi Logan,

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

Yuto Kitamura

0 Logan Cummins 9 months ago in reply to Yuto Kitamura

TI__Guru 63270 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

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DS90UB948-Q1: INTB_IN signal