DS26303 LIU的初始化和配置-新品速递

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文档简介

精品文档-下载后可编辑DS26303LIU的初始化和配置-新品速递引言在为一个新设计的电信系统开发软件时，棘手的任务莫过于实现基本的设备操作。DS26303收发器的大量功能和多端口操作使软件开发更趋复杂。为了方便初期系统开发，DallasSemiconductor公司提供了C风格范例代码，它可以在T1或E1模式下初始化设备，软件开发人员只需针对所需的操作修改代码，或编写与特定系统相关的功能。一旦代码编译完毕，即可载入系统进行测试与评估。需要注意的是DS26303有两个版本，分别是DS26303-120和DS26303-75。它们的区别很小，只会影响到几个设置，因此需要弄清楚设计中用到的是哪个器件。

代码范例

图1中所示的范例代码在稍加修改之后就可以正确编译以供目标系统使用。'write(address,data)'和'wait(milliseconds)'两个函数调用过程与系统相关，因此需要根据所用的微处理器编写。该代码假定设备被映射到16位的本地总线(地址偏移0x0000)，并且设备的数据总线为8位。对于其他情况，则需要修改代码或编写函数调用来解决。此段代码还包含某些寄存器的多种不同设置，从而为开发人员提供了时钟频率、线路编码等参数的多种选择。虽然包含了大量的基本功能，但该代码并不完备。当需要实现其他附加功能时，请参考数据资料。

/*ConfigurationExampleForDS26303-120runninginE1mode.ThisExampleassumesE1operationsothefunctioncallforT1/J1configurationhasbeencommentedout.SimplycommentouttheE1configurationfunctioncallanduncommenttheT1configurationfunctioncallforT1operation.AnindividualfunctioncallforJ1operationisnotpresentbecauseitisverysimilartoT1operationandcouldeasilybeimplementedinthatfunction.ThisfilefollowsCstyleconventions.Howeveractualcodeforthefunctioncallslistedbelowareimplementationspecificandneedtobeadded:FunctionCalls:write(address,data),wait(milliseconds)ThefollowingcommentsonlyindicatesomeofthepossibleclocksourcesthatcanbeusedforeitherE1orT1/J1operation.Masterclockconfigurationcanusemultiplesofn=1,2,4,or8MCLK=Canbeanx1.544ornx2.048MHzsignalforE1orT1/J1Operation

TCLK=Mustbea2.048MHzSignalforE1OperationTCLK=Mustbea1.544MHzsignalforT1/J1Operation*/

voidinitialization_main(){/*GlobalInitializationBegin*/

/*Resetallchannelstotheirdefaultvalues*/write(0x001F,0x00);//ADDP,SetAddressPointertoPrimaryRegisterBankWrite(0x000A,0xFF);//SWR,ResetAllChannels

/*Wait1msforresettocomplete*/wait(1);

/*TheMasterClockSelectRegisterisimportantforproper*//*deviceoperationconsultthedatasheetforallpossibleconfigurations.*/write(0x001F,0x01);//ADDP,SetAddressPointertoIndividualLIURegisterBankwrite(0x0006,0x00);//MC,E1ModeOnlyMCLK-2.048,TECLKCLKADisabled//write(0x0006,0x00);//MC,T1/J1ModeOnlyMCLK-1.544,TECLKCLKADisabled

//write(0x0006,0x03);//MC,T1/J1orE1ModeMCLK-1.544,TECLKCLKADisabled//write(0x0006,0x07);//MC,T1/J1orE1ModeMCLK-3.088,TECLKCLKADisabled//write(0x0006,0x0B);//MC,T1/J1orE1ModeMCLK-6.176,TECLKCLKADisabled//write(0x0006,0x0F);//MC,T1/J1orE1ModeMCLK-12.352,TECLKCLKADisabled

//write(0x0006,0x01);//MC,T1/J1orE1ModeMCLK-2.048,TECLKCLKADisabled//write(0x0006,0x05);//MC,T1/J1orE1ModeMCLK-4.096,TECLKCLKADisabled//write(0x0006,0x09);//MC,T1/J1orE1ModeMCLK-8.192,TECLKCLKADisabled//write(0x0006,0x0D);//MC,T1/J1orE1ModeMCLK-16.384,TECLKCLKADisabled

/*Wait1msforclocktosettleafterconfiguration*/wait(1);

/*TheGCregisterisabletogloballycontroltheAISDuringLOS,ShortCircuit*//*Protection,LineCoding,JADepth,JAPosition,andJAEnablefunctions*/write(0x001F,0x00);//ADDP,SetAddressPointertoPrimaryRegisterBankwrite(0x000F,0x80);//GC,EnableRXInternalImpedance,DisableGlobalControls

/*GlobalInitializationComplete*/

/*ConfigurationBegin*/

e1_configure();

//t1_configure();

/*ConfigurationComplete*/}

voide1_configure(){/*E1InitilizationBegin*/

/*Thisfunctionassumesallportsareconfiguredidentically.Otherwise,*//*thefunctionneedstoberevisedtosupportindividualportaddressing*//*andidentification.*/

/*Configureanalog,remote,ordigitalloopbackasnecessary*/write(0x001F,0x00);//ADDP,SetAddressPointertoPrimaryRegisterBankwrite(0x0001,0x00);//ALBC,DisableAnalogLoopbackfor8Channels//write(0x0001,0xFF);//ALBC,EnableAnalogLoopbackfor8Channelswrite(0x0002,0x00);//RLBC,DisableRemoteLoopbackfor8Channels//write(0x0002,0xFF);//RLBC,EnableRemoteLoopbackfor8Channelswrite(0x000C,0x00);//DLBC,DisableDigitalLoopbackfor8Channels//write(0x000C,0xFF);//DLBC,EnableDigitalLoopbackfor8Channels

/*ConfigureLOS/AIScriteriainE1mode*/write(0x001F,0x00);//ADDP,SetAddressPointertoPrimaryRegisterBankwrite(0x000D,0x00);//LASCS,UseG.775Criteriafor8Channels//write(0x000D,0xFF);//LASCS,UseETSI300233Criteriafor8Channels

write(0x001F,0x00);//ADDP,SetAddressPointertoPrimaryRegisterBankwrite(0x0003,0x00);//TAOE,DisableTransmitAllOnesfor8Channels//write(0x0003,0xFF);//TAOE,EnableTransmitAllOnesfor8Channels

write(0x001F,0x00);//ADDP,SetAddressPointertoPrimaryRegisterBankwrite(0x000E,0x00);//ATAOS,DisableAutomaticTransmitAllOnesfor8Channels//write(0x000E,0xFF);//ATAOS,EnableAutomaticTransmitAllOnesfor8Channels

write(0x001F,0x00);//ADDP,SetAddressPointertoPrimaryRegisterBankwrite(0x0012,0x00);//OEB,DisableTXOutputHighImpedancefor8Channels//write(0x0012,0xFF);//OEB,EnableTXOutputHighImpedancefor8Channels

write(0x001F,0xAA);//ADDP,SetAddressPointertoSecondaryRegisterBankwrite(0x0003,0x00);//RPDE,DisableReceivePower-Downfor8Channels//write(0x0003,0xFF);//RPDE,EnableReceivePower-Downfor8Channels

write(0x001F,0xAA);//ADDP,SetAddressPointertoSecondaryRegisterBankwrite(0x0004,0x00);//TPDE,DisableTransmitPower-Downfor8Channels//write(0x0004,0xFF);//TPDE,EnableTransmitPower-Downfor8Channels

/*Insinglerailmode(SMRSregister)withHDB3/B8ZS(LCSregister)enabled,*//*theEZDEandCVDEBregisterscanenabletheexcessivezeroandcode*//*violationdetectionoutputontheRNEGpin.*/write(0x001F,0xAA);//ADDP,SetAddressPointertoSecondaryRegisterBank//write(0x0000,0x00);//SRMS,DisableSingleRailModeI/Ofor8Channelswrite(0x0000,0xFF);//SRMS,EnableSingleRailModeI/Ofor8Channels

write(0x001F,0xAA);//ADDP,SetAddressPointertoSecondaryRegisterBankwrite(0x0005,0x00);//EZDE,DisableExcessiveZeroDetectfor8Channels//write(0x0005,0xFF);//EZDE,EnableExcessiveZeroDetectfor8Channels

write(0x001F,0xAA);//ADDP,SetAddressPointertoSecondaryRegisterBankwrite(0x0006,0x00);//CVDEB,EnableCodeViolationDetectfor8Channels//write(0x0006,0xFF);//CVDEB,DisableCodeViolationDetectfor8Channels

/*Thefollowingsixfunctionscanbecontrolledindividuallyonaperchannel*//*basisorgloballyusingtheGCregister.TheIAISEL,ISCPD,LCS,IJAFDS,*//*IJAPS,andIJAEareignoredwhenthecorrespondingfunctionintheGC*//*registerisenabled.*/write(0x001F,0x01);//ADDP,SetAddressPointertoIndividualRegisterBankwrite(0x0005,0x00);//IAISEL,DisableIndivAISDuringLOSfor8Channels//write(0x0005,0xFF);//IAISEL,EnableIndivAISDuringLOSfor8Channels

write(0x001F,0x01);//ADDP,SetAddressPointertoIndividualRegisterBankwrite(0x0004,0x00);//ISCPD,EnableIndivShortProtectionfor8Channels//write(0x0004,0xFF);//ISCPD,DisableIndivShortProtectionfor8Channels

write(0x001F,0xAA);//ADDP,SetAddressPointertoSecondaryRegisterBankwrite(0x0001,0x00);//LCS,EnableB8ZS/HDB3Operationfor8Channels//write(0x0001,0xFF);//LCS,EnableAMIOperationfor8Channels

write(0x001F,0x01);//ADDP,SetAddressPointertoIndividualRegisterBank//write(0x0002,0x00);//IJAFDS,IndivJA32BitDepthfor8Channelswrite(0x0002,0xFF);//IJAFDS,IndivJA128BitDepthfor8Channels

write(0x001F,0x01);//ADDP,SetAddressPointertoIndividualRegisterBank//write(0x0001,0x00);//IJAPS,IndivJATransmitPathfor8Channelswrite(0x0001,0xFF);//IJAPS,IndivJAReceivePathfor8Channels

write(0x001F,0x01);//ADDP,SetAddressPointertoIndividualRegisterBank//write(0x0000,0x00);//IJAE,DisableIndivJitterAttenuatorfor8Channelswrite(0x0000,0xFF);//IJAE,EnableIndivJitterAttenuatorfor8Channels

/*ConfigureallchannelsforaE1pulsetemplateoutput.Thisexampleuses*//*theDS26303-120deviceso,TS.TIMPRM=0for120ohmlineimpedances.If*//*thedevicewereaDS26303-75,TS.TIMPRM=1for120ohmlineimpedances.*/write(0x001F,0x00);//ADDP,SetAddressPointertoPrimaryRegisterBank

Write(0x0010,0x00)//TST,SelectChannel1forTemplateConfigurationWrite(0x0011,0x00)//TS,E1Mode120ohmG.703TX/RXImpedanceMatch

Write(0x0010,0x01)//TST,SelectChannel2forTemplateConfigurationWrite(0x0011,0x00)//TS,E1Mode120ohmG.703TX/RXImpedanceMatch

Write(0x0010,0x02)//TST,SelectChannel3forTemplateConfigurationWrite(0x0011,0x00)//TS,E1Mode120ohmG.703TX/RXImpedanceMatch

Write(0x0010,0x03)//TST,SelectChannel4forTemplateConfigurationWrite(0x0011,0x00)//TS,E1Mode120ohmG.703TX/RXImpedanceMatch

Write(0x0010,0x04)//TST,SelectChannel5forTemplateConfigurationWrite(0x0011,0x00)//TS,E1Mode120ohmG.703TX/RXImpedanceMatch

Write(0x0010,0x05)//TST,SelectChannel6forTemplateConfigurationWrite(0x0011,0x00)//TS,E1Mode120ohmG.703TX/RXImpedanceMatch

Write(0x0010,0x06)//TST,SelectChannel7forTemplateConfigurationWrite(0x0011,0x00)//TS,E1Mode120ohmG.703TX/RXImpedanceMatch

Write(0x0010,0x07)//TST,SelectChannel8forTemplateConfigurationWrite(0x0011,0x00)//TS,E1Mode120ohmG.703TX/RXImpedanceMatch}

voidt1_configure(){/*T1InitilizationBegin*/