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- USB issue case study: HS disconnction detection and FS plugin detection
USB issue case study: HS disconnction detection and FS plugin detection
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USB issue case study: HS disconnction detection and FS plugin detection
USB issue case study: HS disconnction detection and FS plugin detection
This is about the case studay from two USB related issues:
#1. Plugin detection issue caused by an errata in i.MX8/8X (host mode).
Very limited unit may encounter this problem. When issue happens, there will be totally no action on USB host port when a debug plugged in.
#2: High Speed disconnection detection issue (host mode):
This may happen on some special USB design which have complex circuit and connector design on the USB path and long USB cable. The USB enumeration might be interrupted by an un-expected disconnection event. System log shows USB recognition started but failed at several different stages during handshake.
For details, please refer to the doc attached (#1/#2).
A reference patch for each has also been made by David.
- instead of Single-ended Amplitude. The waveforms shared can't tell the truth. It confused public people. The differential mode could cancellate the common mode noise which may not trigger the threshold.
- it defines the amplitude 525~625mV based on differential mode. For the real measurement
- should be differential Amplitude
- Suggest to re-call the article and revise it for publishing and sharing.
- the amplitude in differential mode is much lower than that of single-ended.
- The content has something wrong
- you can refer to the USB2.0 spec
