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3.13.20TCISystemTimeClockTicksInterruptRegister(TCITICKS)
VideoCaptureRegisters
Figure3-39.TCISystemTimeClockCompareMaskMSBRegister(TCISTMSKM)
3116
Reserved
R-0
1510
ReservedATCM
R-0R/W-0
LEGEND:R/W=Read/Write;R=Readonly;-n=valueafterreset
Table3-32.TCISystemTimeClockCompareMaskMSBRegister(TCISTMSKM)FieldDescriptions
Description
Bitfieldsymval
(1)
ValueBT.656,Y/CMode,orRawDataModeTCIMode
31-1Reserved-0Reserved.Thereservedbitlocationisalwaysreadas0.Avaluewrittentothisfield
hasnoeffect.
0ATCMOF(value)0-1Notused.ContainstheMSBoftheabsolutetime
comparemask.
DEFAULT0
(1)
ForCSLimplementation,usethenotationVP_TCISTMSKM_ATCM_symval
Thetransportstreaminterfacesystemtimeclockticksinterruptregister(TCITICKS)isusedtogenerate
aninterruptafteracertainnumberofticksofthe27-MHzsystemtimeclock.WhentheTICKCTvalueis
settoXandtheTCKENbitinTCICTLisset,theTICKbitinVPISisseteveryX+1STCLKcycles.Note
thatthetickinterruptcounterandcomparisonlogicfunctionareseparatefromthePCRlogicandalways
countSTCLKcyclesregardlessofthevalueoftheCTMODEbitinTCICTL.
AwritetoTCITICKSresetsthetickcounter0.WheneverthetickcounterreachestheTICKCTvalue,the
TICKbitinVPISissetandthecounterresetsto0.
Topreventinaccuratecomparisonscausedbychangingregisterbits,thesoftwareshoulddisablethetick
countinterrupt(cleartheTCKENbitinTCICTL)priortowritingtoTCITICKS.
TheTCIsystemtimeclockticksinterruptregister(TCITICKS)isshowninFigure3-40anddescribedin
Table3-33.
Figure3-40.TCISystemTimeClockTicksInterruptRegister(TCITICKS)
310
TICKCT
R/W-0
LEGEND:R/W=Read/Write;-n=valueafterreset
Table3-33.TCISystemTimeClockTicksInterruptRegister(TCITICKS)FieldDescriptions
Description
BT.656,Y/CMode,orRawDataTCIMode
Bitfieldsymval
(1)
ValueMode
31-0TICKCTOF(value)0-FFFFFFFFhNotused.Containsthenumberofticksofthe
27-MHzsystemtimeclockrequiredto
generateatickcountinterrupt.
DEFAULT0
(1)
ForCSLimplementation,usethenotationVP_TCITICKS_TICKCT_symval
VideoCapturePort 90SPRUEM1–May2007
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