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...
An Endpoint Descriptor (ED) is a 16-byte, memory resident structure that must be aligned to a 16-byte boundary . The Host Controller traverses lists of EDs and if there are TDs lin...
A Transfer Descriptor (TD) is a system memory data structure that is used by the Host Controller to define a buffer of data that will be moved to or from an endpoint. TDs come in ...
4.3.1.1 General Transfer Descriptor Format 4.3.1.2 General Transfer Descriptor Field Definitions Transfers for control, bulk, and interrupt all use the same format for their Tra...
图7-21:HcRhStatus寄存器结构说明 寄存器位布局(31:0) 字段功能详述 7.4.3 HcRhStatus Register The HcRhStatus register is divided into two parts. The lower word of a Dword represents the Hub Status fi...