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Questions on USB protocol

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promach

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From https://www.keil.com/pack/doc/mw/USB/html/_u_s_b__protocol.html and https://github.com/sigrokproject/sigrok-dumps/tree/master/usb/setup , I have few questions:

1. Why there are two different pipes labelled as 1 and 2 ?

2. What does it mean by 8 microframes of 125us ?’

3. Why the usb_failed_setup_fullspeed.sr waveform being a failed setup ?

4. I do not quite understand the dribble mechanism in section 7.1.9.1 of usb2.0 specification document.

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