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3.13.12TCIClockInitializationLSBRegister(TCICLKINITL)
VideoCaptureRegisters
Table3-24.TCICaptureControlRegister(TCICTL)FieldDescriptions(continued)
Description
Bitfield
(1)
symval
(1)
ValueBT.656,Y/CMode,orRawDataModeTCIMode
3STENOF(value)Systemtimeclockinterruptenablebit.
DEFAULT0Notused.SettingoftheSTCbitisdisabled.
DISABLE
SETNotused.AvalidSTCcomparesetstheSTCbitin
VPIS.
2CTMODEOF(value)Countermodeselectbit.
DEFAULT0Notused.The33-bitPCRportionofthesystemtime
counterincrementsat90kHz(when
90KHZ
PCRErollsoverfrom299to0).
STCLKNotused.The33-bitPCRportionofthesystemtime
counterincrementsbytheSTCLKinput.
1ERRFILTOF(value)Errorfilteringenablebit.
DEFAULT0Notused.Packetswitherrorsarereceivedandthe
PERRbitissetinthetimestampinserted
ACCEPT
attheendofthepacket.
REJECTNotused.Packetswitherrorsarefilteredout(not
receivedintheFIFO).
0Reserved-0Reserved.Thereservedbitlocationisalwaysreadas0.Avaluewrittentothisfield
hasnoeffect.
ThetransportstreaminterfaceclockinitializationLSBregister(TCICLKINITL)isusedtoinitializethe
hardwarecountertosynchronizewiththesystemtimeclock..
Onreceivingthefirstpacketcontainingaprogramclockreference(PCR)andthePCRextensionvalue,
theDSPwritesthe32least-significantbits(LSBs)ofthePCRintoTCICLKINITL.Thisinitializesthe
countertothesystemtimeclock.TCICLKINITLshouldalsobeupdatedbytheDSPwhenevera
discontinuityinthePCRfieldisdetected.
Toensuresynchronizationandpreventfalsecomparedetection,thesoftwareshoulddisablethesystem
timeclockinterrupt(cleartheSTENbitinTCICTL)priortowritingtoTCICLKINITL.Allbitsofthesystem
timecounterareinitializedwhenevereitherTCICLKINITLorTCICLKINITMarewritten.
TheTCIclockinitializationLSBregister(TCICLKINITL)isshowninFigure3-32anddescribedin
Table3-25
Figure3-32.TCIClockInitializationLSBRegister(TCICLKINITL)
310
INPCR
R/W-0
LEGEND:R/W=Read/Write;-n=valueafterreset
Table3-25.TCIClockInitializationLSBRegister(TCICLKINITL)FieldDescriptions
Description
Bitfieldsymval
(1)
ValueBT.656,Y/CMode,orRawDataModeTCIMode
31-0INPCROF(value)0-FFFFFFFFhNotused.Initializesthe32LSBsofthesystem
timeclock.
DEFAULT0
(1)
ForCSLimplementation,usethenotationVP_TCICLKINITL_INPCR_symval
SPRUEM1–May2007VideoCapturePort85
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