本文介绍了USB系统的架构及其工作原理，包括总线拓扑、PCI平台实现、I/O集线器集成、通信流程、软件角色及通信模型等内容。同时，还详细探讨了USB的数据传输类型、I/O请求处理、帧生成与传输等关键技术。
Legacy Peripheral Devices
Bus topology of USB
Implemented in a PCI-based platform
Integrated into I/O hub chip
Communication flow
Software player of USB system
Communications model
Transfer type of USB
I/O request, transactions, frame, packet
Generation of frames
Perform transfer during frame
IN transactions
OUT transactions
Configuration
Software layers
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