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3.13.18TCISystemTimeClockCompareMaskLSBRegister(TCISTMSKL)
3.13.19TCISystemTimeClockCompareMaskMSBRegister(TCISTMSKM)
VideoCaptureRegisters
Table3-30.TCISystemTimeClockCompareMSBRegister(TCISTCMPM)FieldDescriptions
Description
Bitfieldsymval
(1)
ValueBT.656,Y/CMode,orRawDataModeTCIMode
31-1Reserved-0Reserved.Thereservedbitlocationisalwaysreadas0.Avaluewrittentothisfield
hasnoeffect.
0ATCOF(value)0-1Notused.ContainstheMSBoftheabsolutetime
compare.
DEFAULT0
(1)
ForCSLimplementation,usethenotationVP_TCISTCMPM_ATC_symval
ThetransportstreaminterfacesystemtimeclockcomparemaskLSBregister(TCISTMSKL)holdsthe32
least-significantbits(LSBs)oftheabsolutetimecomparemask(ATCM).Thisvalueisusedwith
TCISTMSKMtomaskoutbitsduringthecomparisonoftheATCtothesystemtimeclockforabsolute
time.ThebitsthataresettoonemaskthecorrespondingATCbitsduringthecompare.
Topreventinaccuratecomparisonscausedbychangingregisterbits,thesoftwareshoulddisablethe
systemtimeclockinterrupt(cleartheSTENbitinTCICTL)priortowritingtoTCISTMSKL.
TheTCIsystemtimeclockcomparemaskLSBregister(TCISTMSKL)isshowninFigure3-38and
describedinTable3-31.
Figure3-38.TCISystemTimeClockCompareMaskLSBRegister(TCISTMSKL)
310
ATCM
R/W-0
LEGEND:R/W=Read/Write;-n=valueafterreset
Table3-31.TCISystemTimeClockCompareMaskLSBRegister(TCISTMSKL)FieldDescriptions
Description
Bitfieldsymval
(1)
ValueBT.656,Y/CMode,orRawDataModeTCIMode
31-0ATCMOF(value)0-FFFFFFFFhNotused.Containsthe32LSBsoftheabsolute
timecomparemask.
DEFAULT0
(1)
ForCSLimplementation,usethenotationVP_TCISTMSKL_ATCM_symval
ThetransportstreaminterfacesystemtimeclockcomparemaskMSBregister(TCISTMSKM)holdsthe
most-significantbit(MSB)oftheabsolutetimecomparemask(ATCM).Thisvalueisusedwith
TCISTMSKLtomaskoutbitsduringthecomparisonoftheATCtothesystemtimeclockforabsolute
time.ThebitsthataresettoonemaskthecorrespondingATCbitsduringthecompare..
Topreventinaccuratecomparisonscausedbychangingregisterbits,thesoftwareshoulddisablethe
systemtimeclockinterrupt(cleartheSTENbitinTCICTL)priortowritingtoTCISTMSKM.
TheTCIsystemtimeclockcomparemaskMSBregister(TCISTMSKM)isshowninFigure3-39and
describedinTable3-32
SPRUEM1–May2007VideoCapturePort89
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