IC697MDL250
（串行接口引擎）模塊
SIE是USB控制器的主要模塊；實現(xiàn)協(xié)議層的功能、信息包的解析和組合、同步信號識別、位填充和位 剝離、NRZI（非歸零反轉）的編碼和解碼、同步字段和包結束碼的檢測和生成、CRC5、CRC16校驗等功能；圖 4是設備接收主機發(fā)送數(shù)據(jù)時的狀態(tài)機。
從圖4可以看出設備在沒有數(shù)據(jù)傳輸時處于空閑態(tài)，低速設備空閑時D+、D-處于J態(tài)，當有K態(tài)到來時 進入狀態(tài)轉換；以KJKJKK為同步位，同步字段里的最后的2位是同步字段結束的記號，并且標志了包標識 符（PID，Packet Identifier）的開始。然后根據(jù)不同的PID分別進入地址態(tài)或數(shù)據(jù)態(tài)， 緊跟在地址態(tài)后面的 是端點態(tài)，因為地址和端點分別是有7位和4位構成共11位，所以只要5位CRC校驗就可以了，CRC校驗完后就要結束此次的包傳輸，USB協(xié)議中以2個 SE0態(tài)和一個J態(tài)來表示包的結束。在數(shù)據(jù)態(tài)判斷是否為SE0態(tài)， SE0態(tài)表示8個字節(jié)的數(shù)據(jù)都發(fā)送完畢，因為非SE0態(tài)即J、K態(tài)都表示工作態(tài)，所以在數(shù)據(jù)態(tài)中如果總線上 沒有SE0到來就一直接收數(shù)據(jù)。
IC697MDL250
IC697MDL250聯(lián)系人：李先生
手機：18030229050
電話：0592-5709821
傳真：0592-5709828
QQ 1878187406
郵箱 1878187406@qq.com
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