It focuses on the implement of USB bus enumeration protocol that is necessary for all USB devices and the implement of USB Mass Storage Bulk-Only transport and ATA/ATAPI protocols those are necessary for all USB Mass Storage devices.

• 重点阐述了所有USB设备所必需的USB总线列举协议的固件实现,以及Mass Storage设备所必需的USB Mass Storage Bulk-Only传输和ATA/ATAPI协议的固件实现。