4.2. USB的框架

对于USB的框架，暂时先贴出一些相关图片，细节的解释，有空再写。

图 4.1. USB Implementation Areas

USB Implementation Areas


图 4.2. USB Physical Bus Topology

USB Physical Bus Topology


图 4.3. USB Logical Bus Topology

USB Logical Bus Topology


图 4.4. USB Communication Flow

USB Communication Flow


图 4.5. USB Layers in Linux

USB Layers in Linux


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4.1.1. 为何要搞这么多USB的Class 起始页 4.3. USB Transfer and Transaction