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What's the "OTG_DEACHINT" register in the STM32F7's USB core used for?

Question asked by mamish.john on Nov 28, 2016
Latest reply on Nov 30, 2016 by waclawek.jan
I'm working on developing a USB device with the STM32F746VG, but there is one register in the datasheet that simply mystifies me: OTG_DEACHINT.

The datasheet doesn't say anything about this register except it has the "OUT/IN endpoint 1 interrupt bit(s)" in it.

So I have 2 straightforward questions:

    1. What event does this interrupt signal?
    2. Why is it only for endpoint 1?