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AM3505 USB IAAD interrupt

Guru 10570 points

Hi,
I have a question regarding AM35x USB IAAD(Interrupt on Asynchronous Advance Doorbell) interrupt.
In our observation, it takes a few micro sec to generate IAAD interrupt after writing USBCMD.IAAD bit.

After writing the IAAD bit, what does USB controller do during term?

Detect some external USB signal/condition to occur IAAD interrupt?
Or, it just wait for a few micro second?

Because after IAAD interrupt AM35x sometimes hung up in our system.
I would like to consider workaround.

Best regards, RY