FX3_PROGRAMMERS_MANUALContents yCYPRESS EMBEDDED IN TOMORROW 1.1 Chapter Overview 11 1.2 Document Revision History…… 1.3 Documentation Conventions 着1 12 2.1 USB 2.0 System Basics 13 2.1.1 Host, Devices. and hubs 2.1.2 Signaling Rates 11画 2.1.3 Layers