1、TheintroduceofsoundplaybackchipISD251201ISD2500serieschipProfileISDs2500serieschips/accordingtorecordingtime60seconds/75seconds/90secondsand120secondsintoISD2560/2575/2590and25120fourmodels/ISDdevicewithOVF(overflow)clientforcascadingmultipledevices/ISD2500seriesEEPROMwithcapacityfor480K/uptosub-par
2、agraph600/Fourdifferenttypesofrecordingtimedependsondifferentinputsamplingratetoachieve/andtheywere/8/0/6/4/5/3/4/0kHz/DIPpackage28-pindevices/thepinfunctionasfollows/17A0/M0A6/M6address/modeselection810A7A9enteranaddressline11AUXINinput12/13VSSD/VSSAandanalogtodigital14/15SP+/SP-speakeroutput16VCCA
3、poweranalogsignalpositive17/18MIC/MICREFMicrophoneinputandtheinputreferenceterminal19AGCAGC20/21ANAIN/ANAOUTAnalogsignalinputandoutputSpillage22OUF23CEchipselect(lowtoallowthechipwork)24PD-chiplow-powerstatecontrol25EOManendaudioplaybacksignaloutput26XCLKexternalclock27P/Rrecorded/releasecontroltoch
4、oose28VCCDcathodepowersupplydigitalsignal2WorkingPrinciple2500Series10inputaddressA0A9/thesiterecordedupto1024/addressspaceis01023/Itsdistributionis/Address0299asasub/anddidnotaddresstheuseof600767/7681023fortheaddressmodeselection(ie/A8/A9arehigh)/AddressLine2500serieshastwopurposes/firstasamodeofc
5、ontrol/thesecondsub-recordingsoundasthestartsegmentaddress/Whenthehighestaddressbit(MSB)A8/A9arehigh(ieaddress7681023)/theaddressA0A6-sideasaworkingmodelonthechoiceofclientM0M6/correspondingtosevenkindsofwork/WhentheA8/A9oranyoneforthelowlow(thatis/address0599)/aslongasrecordedinthesub/playbackpre-o
6、peration(lessthan300ns)totheaddressA0A9assignmentoperationfromtheAddresstostart/2500seriesofvoicechipswillbedividedinto480KofEEPROMinformationinparagraph600/800byteseach/Unitasawhole/addressingandcontrolinformationtoeachparagraphshouldbeassignedanaddressfortheexternalcontrolratherthanforeachbyteaddr
7、essing/oratleastaddressport19/Thisgreatlyreducestheinformationneededtoretrievetheaddressline/Ofthespeechsignalcanbealongcross-sectionofanumberofinformationrecording/storageinformationfromthesectionoftheinternalconstraints/andinformationwithinthesitewillautomaticallyincreasethesegment/Eachvoiceinthea
8、utomaticincreaseinthetailsectionofanendmarkEOM/whenthecombinationofplaying/bydetectingEOMtocontroltheendofthevoicesegmentandthebeginningofthenextsection/Informationsectionofeachaudioplaybacktimeequaltothetotaltimedividedby600/ISD2560/suchasthetotaltimeforthe60s/theinformationsectionofeachaudioplayba
9、cktimeof100ms；ISD25120thetotaltimeforthe120s/eachtimeforparagraphinformation200ms/Thereforethelengthoftimecanbeusedasasegmentaddress/throughthetime-parallelsingle-chiptimertotheaddressabovemappinginformationinordertogetthestartaddressofeachrecording/Inthisway/ontheneedtosetupanaddresscounter/General
10、addressfrom0tostartrecording/firstofall/throughtheCPUassignedtoitA0A9/thenstartrecordingISDSCM/SCMtostartthetimeratthesametimethebeginningoftime/everytimeaninformationparagraph/givetheaddresscountplus1/ISDsingle-chipcontrolwhentostoprecordingatthesametimestopthetimertime/Atthispointthevalueofaddress
11、counteristhevoiceoftheparagraphdidnotaddress/plus1underthesectionofspeechisthefirstaddress/andEEPROMinitsexistence/willbeplayingforthenextaddressinformationprovided/ThroughtheCPUassignedtotheaddressA0A9/underthesectionofyourvoicerecording/Followedit/youcanrecordvoiceaboveallatthesametimebethestartin
12、gaddressoftheparagraphs/Ifitisnotstartedfrom0voiceaboveaddress/simplyassigntheinitialaddressA0A9/withthevalueofaddresscountercanbeavoiceattheendoftheaddressabove/Nothereatthesametimetopreservethevoicesegmentstartaddressandendaddress/becauseitisadjacenttoeachparagraph/beforeparagraph1attheendoftheadd
13、ressthatisthestartingaddressofthisparagraph/andeachhaveavoiceattheendofparagraphmarkEOMmaygiveadisruption/UseitwhenplayingandstoredintheEEPROMintheinitialparagraphofthespeechaddressinanyordercombinationofvoiceaboveall/ISD25120录放音芯片介绍1ISD2500系列芯片简介ISD公司的2500系列芯片，按录放时间60秒、75秒、90秒和120秒分成ISD2560、2575、25
14、90和25120四个型号。ISD器件设有OVF（溢出）端，便于多个器件级联。ISD2500系列片内EEPROM容量都为480K，最多能分600段。四个型号的不同录放时间是靠不同的输入采样率来实现的，它们分别为：8/0、6/4、5/3、4/0kHz。DIP器件封装为28脚，各引脚功能如下：17A0/M0A6/M6地址/模式选择810A7A9输入地址线11AUXIN辅助输入12、13VSSD、VSSA数字地和模拟地14、15SP+、SP-扬声器输出16VCCA模拟信号电源正极17、18MIC、MICREF麦克风输入端和输入参考端19AGC自动增益控制20、21ANAIN、ANAOUT模拟信号输入和输出22OUF溢出23CE片选（低电平允许芯片工作）24PD芯片低功耗状态控制25EOM录放音结束信号输出26XCLK外部时钟27P/R录/放控制选择
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