DLPC200 SPI Slave Interface Specification.pdf

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1、Programmer'sGuideDLPU005–October2011DLPC200SPISlaveInterfaceSpecification1PurposeThepurposeofthisdocumentistoprovidedetailsonprogrammingDLPC200chipsetoveritsSPISlaveport.Thedocumentcontainslistofcommandsalongwiththeirdetailedspecifications.Thecommandslistedinthisdocumentprovidesi

2、milarfunctionalityascomparedtotheDLPC200APIreferencemanualthatisusedincontrollingDLPC200overUSBport.ItmustnotedthatnotalltheinterfacesavailableintheAPIreferencemanualaresupportedonSPIinterface.ThisisbecausetheintendeduseonSPIslaveportistoallowrealtimecontrolfunctionality.2Assumpt

3、ionsThisdocumentdoesnotcontaindetailsonSPISlavehardwareinterfacespecifications.RefertotheSPISlaveinterfacesectionofDLPC200datasheetforthesame.3ReferenceLinksDLPC200Datasheet,TILiteratureNumberDLPS014DLPC200APIReferenceManual,TILiteratureNumberDLPA024DLPC200APIProgrammer'sGuide,TI

4、LiteratureNumberDLPA0144OverviewTheSPIslavebusonDLPC200isastandardsynchronousfour-wireserialdatalinkthatoperatesinfullduplexmode.ThereisanadditionalsignalavailabletoreadDLPC200busystatus.TheSPIbusspecifiesfourlogicsignals.•SLAVE_SPI_CLKSerialClock(Outputfrommaster)•SLAVE_SPI_MOSI

5、MasterOutput,SlaveInput(Outputfrommaster)•SLAVE_SPI_MISOMasterInput,SlaveOutput(OutputfromDLPC200)•SLAVE_SPI_CSSlaveSelect(ActiveLOW;outputfrommaster)Additionalsignal•SLAVE_SPI_ACKSlaveisbusy(OutputfromDLPC200)ThedatatransmissionoverSPIbushappensinbyte-by-bytemode.Tobegincommunic

6、ationthemastershouldfirstcheckforSLAVE_SPI_ACKsignalstatusLOW.InthenextstepthemasterpullstheSLAVE_SPI_CSsignaltoLOW.Afterthisthemastercanproceedwithclockingdataatafrequencylessthanorequalto5MHz.DuringeachSPIclockcycle,afullduplexdatatransmissionoccurs;thatisthemastersendsabitonth

7、eSLAVE_SPI_MOSIline;theslavereadsitfromthatsamelineandtheslavesendsabitontheSLAVE_SPI_MISOline;themasterreadsitfromthatsameline.ThemastermustalwayscheckSLAVE_SPI_ACKLOWbeforetransmittingorreceivingdatabyte.ThecommandssupportedoverSPIinterfaceareidentifiedwiththename"ExtendedPacke

8、tname'".AnExtendedPacketisrepresentedasa