字段功能说明 The HcRhPortStatus[1:NDP] register is used to control and report port events on a per-port basis. NumberDownstreamPorts represents the number of HcRhPortStatus registers t...
Hub descriptors are derived from the general USB device framework. Hub descriptors define a hub device and the ports on that hub. The host accesses hub descriptors through the hub...
There are four data transfer types defined in USB. Each type is optimized to match the service requirements between the client software and the USB device. The four types are:· In...
图7-20:HcRhDescriptorB 寄存器 寄存器位布局(31:0) 字段功能说明 The HcRhDescriptorB register is the second register of two describing the characteristics of the Root Hub. These fields are writte...