CAJ | 학술논문

主要讲述了USB设备的基本状态和在这些状态基础上的通用操作。基本状态包括连接、加电、缺省、编址、配置、挂起等。通用操作有设备的动态连接与移去、设置地址、信息配置、数据传送、电源管理、请求处理及出错处理等。这些操作中重点介绍了USB设备请求的协议：所有USB设备在其缺省控制通道处对主机的请求发出响应；这些请求是由控制传送来完成的；请求及请求的参数通过Setup包发向设备，由主机负责设置Setup包内每个域的值；每个Setup包有8个字节。在多个标准设备请求中所提到的描述表是有一定格式的数据集。描述表共有5种类型：设备、配置、接口、端点、字串描述表。它是用来反映设备的特性，本质上是描述设备信息的关系数据库。
주요강술료USB설비적기본상태화재저사상태기출상적통용조작。기본상태포괄련접、가전、결성、편지、배치、괘기등。통용조작유설비적동태련접여이거、설치지지、신식배치、수거전송、전원관리、청구처리급출착처리등。저사조작중중점개소료USB설비청구적협의：소유USB설비재기결성공제통도처대주궤적청구발출향응；저사청구시유공제전송래완성적；청구급청구적삼수통과Setup포발향설비，유주궤부책설치Setup포내매개역적치；매개Setup포유8개자절。재다개표준설비청구중소제도적묘술표시유일정격식적수거집。묘술표공유5충류형：설비、배치、접구、단점、자천묘술표。타시용래반영설비적특성，본질상시묘술설비신식적관계수거고。
The basal states of USB device and com mon operations based on them are described.The basal states include attached,pow ered,default,address,configured,suspended,etc.The common operations are dynamic attachment and removal,address assignment,configuration,data transfer,power mana gement,request processing,request error.Among them,the protocol of request proce ssing is emphasized.All USB devices respond to host's request through their defa ult control pipe.These requests are made using control transfer.The request and its parameters are sent to device by setup packet,and host sets the values in th e fields of setup packet.Each setup packet has eight bytes.The descriptor used i n several device requests is the data set with a defined format.There are five k inds of descriptor:device,configuration,interface,endpoint,and UNICODE string.Th ey reflect device characteristics and are essentially relational databases descr ibing device information.