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3.13.16TCISystemTimeClockCompareLSBRegister(TCISTCMPL)
3.13.17TCISystemTimeClockCompareMSBRegister(TCISTCMPM)
VideoCaptureRegisters
ThetransportstreaminterfacesystemtimeclockcompareLSBregister(TCISTCMPL)isusedtogenerate
aninterruptatsomeabsolutetimebasedontheSTC.TCISTCMPLholdsthe32least-significantbits
(LSBs)oftheabsolutetimecompare(ATC).WheneverthevalueinTCISTCMPLandTCISTCMPMmatch
theunmaskedbitsofthetimekeptbytheSTChardwarecounterandtheSTENbitinTCICTLisset,the
STCbitinVPISisset..
Topreventinaccuratecomparisonscausedbychangingregisterbits,thesoftwareshoulddisablethe
systemtimeclockinterrupt(cleartheSTENbitinTCICTL)priortowritingtoTCISTCMPL.
TheTCIsystemtimeclockcompareLSBregister(TCISTCMPL)isshowninFigure3-36anddescribedin
Table3-29
Figure3-36.TCISystemTimeClockCompareLSBRegister(TCISTCMPL)
310
ATC
R/W-0
LEGEND:R/W=Read/Write;-n=valueafterreset
Table3-29.TCISystemTimeClockCompareLSBRegister(TCISTCMPL)FieldDescriptions
Description
Bitfieldsymval
(1)
ValueBT.656,Y/CMode,orRawDataModeTCIMode
31-0ATCOF(value)0-FFFFFFFFhNotused.Containsthe32LSBsoftheabsolute
timecompare.
DEFAULT0
(1)
ForCSLimplementation,usethenotationVP_TCISTCMPL_ATC_symval
ThetransportstreaminterfacesystemtimeclockcompareMSBregister(TCISTCMPM)isusedto
generateaninterruptatsomeabsolutetimebasedontheSTC.TCISTCMPMholdsthemost-significant
bit(MSB)oftheabsolutetimecompare(ATC).WheneverthevalueinTCISTCMPMandTCISTCMPL
matchtheunmaskedbitsofthetimekeptbytheSTChardwarecounterandtheSTENbitinTCICTLis
set,theSTCbitinVPISisset..
Topreventinaccuratecomparisonscausedbychangingregisterbits,thesoftwareshoulddisablethe
systemtimeclockinterrupt(cleartheSTENbitinTCICTL)priortowritingtoTCISTCMPM.
TheTCIsystemtimeclockcompareMSBregister(TCISTCMPM)isshowninFigure3-37anddescribed
inTable3-30
Figure3-37.TCISystemTimeClockCompareMSBRegister(TCISTCMPM)
3116
Reserved
R-0
1510
ReservedATC
R-0R/W-0
LEGEND:R/W=Read/Write;R=Readonly;-n=valueafterreset
VideoCapturePort 88SPRUEM1–May2007
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