Oct 8, 2021 #1 P promach Advanced Member level 4 Joined Feb 22, 2016 Messages 1,199 Helped 2 Reputation 4 Reaction score 5 Trophy points 1,318 Activity points 11,636 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.
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.