IC697MDL250
（串行接口引擎）模塊
SIE是USB控制器的主要模塊；實(shí)現(xiàn)協(xié)議層的功能、信息包的解析和組合、同步信號(hào)識(shí)別、位填充和位 剝離、NRZI（非歸零反轉(zhuǎn)）的編碼和解碼、同步字段和包結(jié)束碼的檢測(cè)和生成、CRC5、CRC16校驗(yàn)等功能；圖 4是設(shè)備接收主機(jī)發(fā)送數(shù)據(jù)時(shí)的狀態(tài)機(jī)。
從圖4可以看出設(shè)備在沒有數(shù)據(jù)傳輸時(shí)處于空閑態(tài)，低速設(shè)備空閑時(shí)D+、D-處于J態(tài)，當(dāng)有K態(tài)到來(lái)時(shí) 進(jìn)入狀態(tài)轉(zhuǎn)換；以KJKJKK為同步位，同步字段里的最后的2位是同步字段結(jié)束的記號(hào)，并且標(biāo)志了包標(biāo)識(shí) 符（PID，Packet Identifier）的開始。然后根據(jù)不同的PID分別進(jìn)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(diǎn)態(tài)，因?yàn)榈刂泛投它c(diǎn)分別是有7位和4位構(gòu)成共11位，所以只要5位CRC校驗(yàn)就可以了，CRC校驗(yàn)完后就要結(jié)束此次的包傳輸，USB協(xié)議中以2個(gè) SE0態(tài)和一個(gè)J態(tài)來(lái)表示包的結(jié)束。在數(shù)據(jù)態(tài)判斷是否為SE0態(tài)， SE0態(tài)表示8個(gè)字節(jié)的數(shù)據(jù)都發(fā)送完畢，因?yàn)榉荢E0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(lái)就一直接收數(shù)據(jù)。
IC697MDL250
IC697MDL250聯(lián)系人：李先生
手機(jī)：18030229050
電話：0592-5709821
傳真：0592-5709828
QQ 1878187406
郵箱 1878187406@qq.com
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