3TAS5518CControlsandStatus
3.1I
2
CStatusRegisters
3.1.1GeneralStatusRegister(0x01)
3.1.2ErrorStatusRegister(0x02)
3.2TAS5518CPinControls
3.2.1Reset(RESET)
TAS5518C
8-ChannelDigitalAudioPWMProcessor
SLES238A–SEPTEMBER2008–REVISEDJULY2009
www.ti.com
TheTAS5518CprovidescontrolandstatusinformationfromboththeI
2
Cregistersanddevicepins.
Thissectiondescribessomeofthesecontrolsandstatusfunctions.TheI
2
Csummaryanddetailed
registerdescriptionsarecontainedinSection6andSection7.
TheTAS5518Chastwostatusregistersthatprovidegeneraldeviceinformation.Thesearethegeneral
statusregister0(0x01)andtheerrorstatusregister(0x02).
•Deviceidentificationcode
•Clipindicator–TheTAS5518Chasaclippingindicator.Writingtotheregisterclearstheindicator.
•Nointernalerrors(thevalidsignalishigh)
•Aclockerrorhasoccurred–Thesearestickybitsthatareclearedbywritingtotheregister.
–LRCLKerror–whenthenumberofMCLKsperLRCLKisincorrect
–SCLKerror–whenthenumberofSCLKSperLRCLKisincorrect
–Frameslip–whenthenumberofMCLKsperLRCLKchangesbymorethan10MCLKcycles
–PLLphase-lockerror
•Thiserrorstatusregisterisnormallyusedforsystemdevelopmentonly.
TheTAS5518Cprovideanumberofterminalcontrolstomanagethedeviceoperation.Thesecontrols
are:
•RESET
•PDN
•BKND_ERR
•HP_SEL
•MUTE
TheTAS5518Cisplacedintheresetmodeeitherbythepower-upresetcircuitrywhenpowerisapplied,
orbysettingtheRESETterminallow.
RESETisanasynchronouscontrolsignalthatrestorestheTAS5518Ctothehard-mutestate(M-state).
Mastervolumeisimmediatelysettofullattenuation(thereisnorampdown).Resetinitiatesthedevice
resetwithoutanMCLKinput.AslongastheRESETterminalisheldlow,thedeviceisintheresetstate.
Duringreset,allI
2
Candserialdatabusoperationsareignored.
Table3-1showsthedeviceoutputsignalswhileRESETisactive.
Table3-1.DeviceOutputsDuringReset
SIGNALSIGNALSTATE
ValidLow
PWMP-outputsLow(M-state)
PWMM-outputsLow(M-state)
SDASignalinput(notdriven)
TAS5518CControlsandStatus 42SubmitDocumentationFeedback
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