官方的USB OTG协议，非常的好用！！

本书详细说明了USB20与OTG规范的内容。介绍了USB的术语、缩写及产生背景；USB规范的基本知识，包括USB总线的结构体系概述和USB数据流模型；USB接口的机械特性，主要说明其外壳和PCB开发的问题；USB总线的电气规范；USB总线的协议层和设备结构；USB主机的硬件和软件开发；USB集线器规范及OTG规范。本书适于参与USB接口开发的电子工程师和机械工程师参考。

USB 官方协议文档，包含 | USB 3.1 Appendix E Rev1.0.pdf | USB 3.1 Specification Welcome Message - Oct 2014.pdf | USB 3_0 Adopters Agreement Final_020411.pdf | USB_3_1_r1.0.pdf | USB_OTG_and_EH_3-0_release_1_1_10May2012.pdf | +---SuperSpeed Inter-Chip (SSIC) | SuperSpeed_Inter-Chip_Supplement_redlined_release_draft_1_02__19May2014.pdf | SuperSpeed_Inter-Chip_Supplement__1_02__19May2014.pdf | +---USB 3.1 ECNs | | USB 3.1 ECN CTLE.pdf | | USB 3.1 ECN HSEQ.pdf | | USB 3.1 ECN HubDelay.pdf | | USB 3.1 ECN LTM.pdf | | USB 3.1 ECN PollingLFPS.pdf | | USB 3.1 ECN PTM Value.pdf | | USB 3.1 ECN SKP OS Bytes During Compliance Clarification.pdf | | USB 3.1 ECN SKP OS.pdf | | USB 3.1 ECN SLC IS SDS.pdf | | USB 3.1 ECN SSP ping.LFPS tRepeat Requirement.pdf | | USB 3.1 ECN SSP System Jitter Budget.pdf | | USB 3.1 ECN tHubdriveresume.pdf | | USB 3.1 ECN TSEQ Gen2 Clarification.pdf | | USB 3.1 ECN Vbus 5V Nominal Range.pdf | | USB 3.1 ECN VBUS Max Limit.pdf | | | \---USB 3.1 PHY ECNs | USB 3 1 ECN PHY 002 for TSEQ SKP insertion interval.pdf | USB 3 1 ECN PHY 005 for Loopback BERT.pdf | USB 3 1 ECN PHY 009 for Reference Clock Reqs.pdf | USB 3 1 ECN PHY 010 for Loss Budget Clarification.pdf | USB 3 1 ECN PHY 011 for Rx JTOL RJ Correction.pdf | USB 3 1 ECN PHY 013 for u3 Common Mode.pdf | USB 3 1 ECN PHY 014 for SCD clarifications.pdf | USB 3 1 ECN PHY 015 for TSEQ clarifications.pdf | USB 3 1 ECN PHY 016 for Retimer PTM.pdf | USB 3 1 ECN PHY 017 for Rx High Z measurement.pdf | USB 3 1 ECN PHY 018 for Rx High Z value.pdf | USB 3 1 ECN PHY 019 for Gen 1 AC coupling.pdf | USB 3 1 ECN PHY 020 for Tx RJ measurement point.pdf | USB 3 1 ECN PHY 021 for LFPS typos.pdf | +---USB Authentication | USB_AUTHENTICATION R1_0 - 20160325.pdf | +---USB Debug Class | USB Debug Class Rev 1 0 Final.pdf | +---USB Port Controller Interface | USB-Port Controller Specification Rev1.0 v1.1 redline.pdf | USB-Port Controller Specification Rev1.0 v1.1.pdf | +---USB Power Delivery | | USB PD - USB 2.0 Amendment 20120709.pdf | | USB_PD_R2_0 V1.2 -20160325 - ECN clean markup 20160802.pdf | | USB_PD_R2_0 V1.2 -20160325 - ECN redline markup 20160802.pdf | | | \---USB PD 2.0 ECNs | USB PD 2.0 ECN for Applicability of Messages.pdf | USB PD 2.0 ECN for bcdDevice.pdf | USB PD 2.0 ECN for DRP and DRD bits in Capabilities Messages.pdf | USB PD 2.0 ECN for iCapChange Removal.pdf | USB PD 2.0 ECN for Sink NoResponseTimer.pdf | USB PD 2.0 ECN for Source State Diagram.pdf | USB PD 2.0 ECN for VDM Language.pdf | USB PD 2.0 ECN for vSafe5V Voltage Range Clarification.pdf | USB PD 2.0 ECN for Wait Timing.pdf | USB PD ECN PD2.0 Externally Powered becomes Unconstrained Power.pdf | USB PD ECN PD2.0 Unexpected message received in PE_Ready state.pdf | \---USB Type-C | USB Type-C Locking Connector Specification Rev 1_0 20160309.pdf | USB Type-C Specification Release 1.2 - Redline from 1.1.pdf | USB Type-C Specification Release 1.2.pdf | \---USB Type-C ECNs USB Type-C ECN Audio Adapter State Change.pdf USB Type-C ECN Debug Accessory Appendix.pdf USB Type-C ECN for Correction for Attached.SNK.pdf USB Type-C ECN for Debug Accessory Appendix.pdf USB Type-C ECN for Plug overmold length.pdf USB Type-C ECN for removing proprietary charging methods.pdf USB Type-C ECN for Source VCONN Discharge.pdf USB Type-C ECN for SRC to TRY SRC Looping.pdf USB Type-C ECN for USB 2_0 Type-C receptacle.pdf USB Type-C ECN for USB2 DC Resistance.pdf USB Type-C ECN for VBUS Coupling.pdf USB Type-C ECN for Vconn Requirements.pdf USB Type-C ECN Multi-port Chargers.pdf USB Type-C ECN Try.SNK Try.SRC.pdf USB Type-C ECN USB 2.0 hubs with Type-C connectors.pdf USB Type-C ECN Vconn for Power Adapters.pdf

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USB2.0与OTG规范及开发指南(中文版)，很好的USB OTG开发指导文档，有需要的同学可以下载了解。