嵌入式高速usb主機系統(tǒng)的設(shè)計與實現(xiàn)

1、西安電子科技大學(xué)碩士學(xué)位論文嵌入式高速USB主機系統(tǒng)的設(shè)計與實現(xiàn)姓名：李健申請學(xué)位級別：碩士專業(yè)：信號與信息處理指導(dǎo)教師：李真芳20100101AbstractAbstractUSB(UniversalSerialBus)isaveryimportantkindofcommunicationbusandhasbeenwidelyusedForexample，theexternaldevicesofcomputersuchasmouse，

2、keyboard，flashdisk，portableharddisk，printerdigitalcameramobilephone，scanneremulatormobileCDROM，USBmikeandPCcameraaleconnectedtothecomputerviatheUSBinterfaceItexperiencesRevl0，Revl1andRev20specifications，andnowRev30hasals

3、obeenreleasedDeviceswhichcomplytoUSB30arebeingdevelopedNowtheUSBsupportthreekindsoftransferswhicharelowspeed(15Mb／s)，fullspeed(12Mb／s)andhighspeed(480Mb／s)，respectivelyThetransferspeedofUSB30is48Gb／s，SOitwillbeusedmorewi

4、delywhenitisdevelopedInthisdissertation，weintroduceakindofDSP—basedhighspeedUSBhostsystemTheUSBhostsystemsupportslowspeed，fullspeedandhi曲speedtransfersThemaincontrollerofthehostsystemisADSPBF531andtheUSBhostchipisISPI760

5、whichsuppoIrtshighspeedandcomplystoUSB20BF531controlstheISPI760asitsexternalasynchronousmemoryInordertoimprovetheefficiencyofthecodeexecution，weuseassemblylanguagetoprogramthelowleveldriverUSBmassstorageclassprotocol，SCS

6、IcommandsandFAT32filesystemAlso，wecancreate，delete，readandwritefileswhichareontheflashdiskorportableharddiskThehighestspeedofreadingdatais225MBytes／sandhighestspeedofthewritingdatais15Mbytes／sKeyword：USBHostHighSpeedISPl