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3.7.2GPIOPinFunctionAfterDeviceIsProgrammed
3.8InputandOutputSerialAudioPorts
TAS3108,TAS3108IA
AUDIODIGITALSIGNALPROCESSORS
SLES152B–OCTOBER2005–REVISEDNOVEMBER2007
longerdrivingtheGPIOpinlowaftertheloadhascompleted(~100msfollowingaresetifnoEEPROM
ispresent),thestateoftheGPIOpincanbeobserved.
ThenthesystemcontrollercanaccesstheTAS3108/TAS3108IAthroughtheI
2
Cinterfaceandreadthe
statusregistertodeterminetheloadstatus.
IftheGPIOpinstateisnotobserved,theonlyindicationthatthedevicehascompleteditsinitialization
procedureisthattheTAS3108/TAS3108IAstreamsaudioandtheI
2
Cslaveinterfacehasbeenenabled.
OncetheTAS3108/TAS3108IAhasbeenprogrammed,eitherthroughasuccessfulbootloadorviaslave
I
2
Cdownload,theoperationofGPIOcanbeprogrammedtobeaninputand/oroutput.
TheTAS3108/TAS3108IAsupportssystemarchitecturesthatrequiredataformatconversionsbetween
TDMandnon-TDMofthesameformattypewithouttheneedforadditionalgluelogic.Inaddition,the
TAS3108/TAS3108IAsupportsdataformatconversionsbetweenrightjustifiedandI
2
Sandbetweenleft
justifiedandI
2
S.AllthesupportedconversionsarelistedinTable3-1.Iftheinputportisconfiguredfora
TDMformat,onlySDIN1isactive.IfaTDMformatisselectedfortheoutputport,onlySDOUT1isactive.
Table3-1.SupportedConversions
INPUTSAPOUTPUTSAP
(SDIN1,SDIN2,SDIN3,SDIN4)(SDOUT1,SDOUT2,SDOUT3,SDOUT4)
2channelleftjustifiedTDMleftjustified
2channelleftjustified2channelI
2
S
TDMleftjustified2channelleftjustified
2channelI
2
STDMI
2
S
TDMI
2
S2channelI
2
S
2channelI
2
S2channelleftjustified
2channelI
2
S2channelrightjustified
2channelrightjustified2channelI
2
S
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