目录树如下所示:
├ECNs
│ ├USB Type-C R2.1 ECN Dual-Role Products Swap Guidelines.pdf
│ ├Marked Cable Correction.pdf
│ ├Min Functional Cable Voltage.pdf
│ ├Sinking Host-Sourcing Device Swap Clarifications.pdf
│ ├Try.SRC and Try.Snk Usage Clarifications.pdf
│ ├USB Terminations for USB4 and Alt Mode UFPs.pdf
│ ├USB2 Attenuation Update.pdf
│ ├USB2 DCR Update.pdf
│ ├USB4 VDO Response Clarification.pdf
├USB Type-C Spec R2.1 - May 2021 REDLINE versus R2.0.pdf
├USB Type-C Spec R2.1 - May 2021.pdf