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CircuitDescription
2-4
2-2.Key
Thisis consisted ofkeyinterface pinsamong U302,KEYSENSE_N(0:4).Thesesignals composethe matrix.
Resultofmatrixinformsthe key statustokeyinterfaceinthe U302.Poweron/off keyis seperated fromthe
matrix.So poweron/off signal is connected withU302 to enableU601. twelvekeyLEDusethe "VBAT"supply
voltage."KEY_LED"signalenablesLEDswithcurrentcontrol."HALL_SW"informsthe statusof folder (open or
closed)tothe.Thisusesthe hall effect IC,A3210ELH.Amagnetundermain LCD enablesA3210ELH.
2-3.EMIESDFilter
This systemusesthe EMIESDfilter,SMF05 to protectnoisefromIFCONNECTORpart.
2-4. IFconnetor
It is24-pinconnector.Theyare designed to useVBATT,CF,M_TXD0,M_RXD0,RTS,CTS,JIG_ON,
HFK_DETECT,M_RXD0,M_TXD0,HFK_MIC+,HFK_MIC-,HFK_SPK+,HFK_SPK-and GND.They connected to
powersupplyIC,microprocessorand signalprocessorIC.
3.Audio
EAR1OPand EAR1ONfromU302 areconnected tothe mainspeaker.AUXOPand AUXONareconnected to
the Handsfree kit. MIC_Pand MIC_Nareconnected tothe mainMIC.And EAR_MIC1Pand EAR_MIC1Nare
connected tothe Earphone.
YMU765 hasa built-in amplifier,and thus,isan idealdeviceforoutputting soundsthatare used bymobile
phonesin addition to gamesoundsand ringing melodiesthatarereplayed byasynthesizer.
The synthesizersection adopts"stereophonichybridsynthesizersystem"thatare given advantagesofbothFM
synthesizersand WaveTablesynthesizersto allowsimultaneousgeneration ofup to 32 FMvoicesand 32 Wave
Tablevoices.Furthermore,YMU765 hasa built-in hardwaresequencerthathelpstorealizecomplexplaywithout
heavilyloading the hostCPU.And thisdevice also hasa built-incircuit forcontrolling vibratorsand LEDs
synchronizing with playofmusic.The consumed electric currentcan be stopped tothe minimumbypowerdown
mode when notoperating.
The hardwaresequence builtinthisdevice allowsplaying of the complexmusicwithoutgiving excessiveload to
the CPUof the portabletelephones.Moreover, the registersof the FMsynthesizercan be operated directlyfor
realtimesound generation,allowing, forexample,utilization ofvarious sound effectswhen using the game
softwareinstalled inthe portabletelephone.
4.Memory
The signalsinthe MSM6200 enabletwomemories.Theyuse onlyone voltsupply voltage,VDD_LPfromthe
PM6050.This systemusesAMD'smemory,AM50DL128BG.Itis consisted of128MbitsflashNORmemoryand
32MbitsSRAM memory.Ithas16 bitdataline,AD[0~15]whichis connected toMSM6200.Ithas22 bit
address lines,A[1~22]. ROM_CSand RAM_CSsignalsis chipselect.
Inthe multi-media processor,ithasthree type memories.One is256MbitNorFlashmemoryanotheris256Mbit
NAND Flashmemoryand the otheris128MbitSDRAM memory.Multi-media processordoesn'thaveaNAND
memoryinterface.Butwemake a software algorithmuseforNAND memory.