TheintroduceofsoundplaybackchipISD251201ISD2500serieschipProfileISDs2500serieschips,accordingtorecordingtime60seconds,75seconds,90secondsand120secondsintoISD2560,2575,2590and25120fourmodels.ISDdevicewithOVF(overflow)clientforcascadingmultipledevices.ISD2500seriesEEPROMwithcapacityfor480K,uptosub-paragraph600.Fourdifferenttypesofrecordingtimedependsondifferentinputsamplingratetoachieve,andtheywere:8.0,6.4,5.3,4.0kHz.DIPpackage28-pindevices,thepinfunctionasfollows:17A0/M0A6/M6address/modeselection810A7A9enteranaddressline11AUXINinput12,13VSSD,VSSAandanalogtodigital14,15SP+,SP-speakeroutput16VCCApoweranalogsignalpositive17,18MIC,MICREFMicrophoneinputandtheinputreferenceterminal19AGCAGC20,21ANAIN,ANAOUTAnalogsignalinputandoutputSpillage22OUF23CEchipselect(lowtoallowthechipwork)24PD-chiplow-powerstatecontrol25EOManendaudioplaybacksignaloutput26XCLKexternalclock27P/Rrecorded/releasecontroltochoose28VCCDcathodepowersupplydigitalsignal2WorkingPrinciple2500Series10inputaddressA0A9,thesiterecordedupto1024,addressspaceis01023.Itsdistributionis:Address0299asasub,anddidnotaddresstheuseof600767,7681023fortheaddressmodeselection(ie,A8,A9arehigh).AddressLine2500serieshastwopurposes,firstasamodeofcontrol,thesecondsub-recordingsoundasthestartsegmentaddress.Whenthehighestaddressbit(MSB)A8,A9arehigh(ieaddress7681023),theaddressA0A6-sideasaworkingmodelonthechoiceofclientM0M6,correspondingtosevenkindsofwork.WhentheA8,A9oranyoneforthelowlow(thatis,address0599),aslongasrecordedinthesub/playbackpre-operation(lessthan300ns)totheaddressA0A9assignmentoperationfromtheAddresstostart.2500seriesofvoicechipswillbedividedinto480KofEEPROMinformationinparagraph600,800byteseach.Unitasawhole,addressingandcontrolinformationtoeachparagraphshouldbeassignedanaddressfortheexternalcontrolratherthanforeachbyteaddressing,oratleastaddressport19.Thisgreatlyreducestheinformationneededtoretrievetheaddressline.Ofthespeechsignalcanbealongcross-sectionofanumberofinformationrecording,storageinformationfromthesectionoftheinternalconstraints,andinformationwithinthesitewillautomaticallyincreasethesegment.EachvoiceintheautomaticincreaseinthetailsectionofanendmarkEOM,whenthecombinationofplaying,bydetectingEOMtocontroltheendofthevoicesegmentandthebeginningofthenextsection.Informationsectionofeachaudioplaybacktimeequaltothetotaltimedividedby600.ISD2560,suchasthetotaltimeforthe60s,theinformationsectionofeachaudioplaybacktimeof100ms；ISD25120thetotaltimeforthe120s,eachtimeforparagraphinformation200ms.Thereforethelengthoftimecanbeusedasasegmentaddress,throughthetime-parallelsingle-chiptimertotheaddressabovemappinginformationinordertogetthestartaddressofeachrecording.Inthisway,ontheneedtosetupanaddresscounter.Generaladdressfrom0tostartrecording,firstofall,throughtheCPUassignedtoitA0A9,thenstartrecordingISDSCM,SCMtostartthetimeratthesametimethebeginningoftime,everytimeaninformationparagraph,givetheaddresscountplus1.ISDsingle-chipcontrolwhentostoprecordingatthesametimestopthetimertime.Atthispointthevalueofaddresscounteristhevoiceoftheparagraphdidnotaddress,plus1underthesectionofspeechisthefirstaddress,andEEPROMinitsexistence,willbeplayingforthenextaddressinformationprovided.ThroughtheCPUassignedtotheaddressA0A9,underthesectionofyourvoicerecording.Followedit,youcanrecordvoiceaboveallatthesametimebethestartingaddressoftheparagraphs.Ifitisnotstartedfrom0voiceaboveaddress,simplyassigntheinitialaddressA0A9,withthevalueofaddresscountercanbeavoiceattheendoftheaddressabove.Nothereatthesametimetopreservethevoicesegmentstartaddressandendaddress,becauseitisadjacenttoeachparagraph,beforeparagraph1attheendoftheaddressthatisthestartingaddressofthisparagraph,andeachhaveavoiceattheendofparagraphmarkEOMmaygiveadisruption.UseitwhenplayingandstoredintheEEPROMintheinitialparagraphofthespeechaddressinanyordercombinationofvoiceaboveall.ISD25120錄放音芯片介紹1ISD2500系列芯片簡(jiǎn)介ISD公司的2500系列芯片，按錄放時(shí)間60秒、75秒、90秒和120秒分成ISD2560、2575、2590和25120四個(gè)型號(hào)。ISD器件設(shè)有OVF（溢出）端，便于多個(gè)器件級(jí)聯(lián)。ISD2500系列片內(nèi)EEPROM容量都為480K，最多能分600段。四個(gè)型號(hào)的不同錄放時(shí)間是靠不同的輸入采樣率來(lái)實(shí)現(xiàn)的，它們分別為：8.0、6.4、5.3、4.0kHz。DIP器件封裝為28腳，各引腳功能如下：17A0/M0A6/M6地址/模式選