CAJ | 학술논문

USB协议层描述了USB主机与USB设备交互时的语法和协议，从中定义了字段、包、事务和传送的结构，以及由字段到包、由包到事务、由事务到传送所组成的组织层次关系。协议同时还规范了数据链路的建立，正常或异常传送处理的动态过程。字段中分同步、包标识符、地址、帧号、数据和CRC校验等字段。包中分标记、帧起始、数据、握手4类包。事务中有批处理、控制、中断和同步4类事务。传送可分为控制、批处理、中断和同步4类传送。字段、包、事务和传送的命名和定义，实质上是为了满足不同需求的传送内容，在链路建立、数据传送及链路拆除的可靠执行中所采用的一系列保障措施。
USB협의층묘술료USB주궤여USB설비교호시적어법화협의，종중정의료자단、포、사무화전송적결구，이급유자단도포、유포도사무、유사무도전송소조성적조직층차관계。협의동시환규범료수거련로적건립，정상혹이상전송처리적동태과정。자단중분동보、포표식부、지지、정호、수거화CRC교험등자단。포중분표기、정기시、수거、악수4류포。사무중유비처리、공제、중단화동보4류사무。전송가분위공제、비처리、중단화동보4류전송。자단、포、사무화전송적명명화정의，실질상시위료만족불동수구적전송내용，재련로건립、수거전송급련로탁제적가고집행중소채용적일계렬보장조시。
USB protocol layer describes the grammar and protocol used in the communication of USB host with USB devices,and presents the USB hierarchy consisting of fields ,packets, transactions and transfers. Furthermore, it defines the dynamic proce d utes of data-link set-up and normal or abnormal transfer processing. Six field types are SYNC Field, Packet Identifier Field, Address Field, Frame Number Fiel d, Data Field and CRC Field. Four packet trpes are Token,Data, Handshake and Spe cial. Four transaction types are Bulk Transaction, Set-Up Transaction,Interrupt Transaction and Isochronous Transaction. Four transfer types are Bulk Transfer, Control Transfer, Interrupt Transfer and Isochronous Transaction.Essentially, t he name and definition of fields, packets, transactions and transfers are the en suring measures in data-link set-up,data transfer and data-link disconnection for satisfying various data transmission.