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a a’ b b’ c c’ d w w’ x x’
a b c d w x y
y
Cb’
a
= (-3Cb
cd
+ 33Cb
ab
+ 101Cb
ab
-3Cb
cd
)/128
Cr’
a
= (-3Cr
cd
+ 33Cr
ab
+ 101Cr
ab
-3Cr
cd
)/128
y’
ab cd z
Horizontal Image Size
Trailing edge
replicated chroma
samples
wx yz
z z’
yz wxabcd
Cb’
b
= (-3Cb
ab
+ 101Cb
ab
+ 33Cb
cd
-3Cb
ef
)/128
Cr’
b
= (-3Cr
ab
+ 101Cr
ab
+ 33Cr
cd
-3Cr
ef
)/128
Cb’
c
= (-3Cb
ab
+ 33Cb
ab
+ 101Cb
cd
-3Cb
ef
)/128
Cr’
c
= (-3Cr
ab
+ 33Cr
ab
+ 101Cr
cd
-3Cr
ef
)/128
Cb’
d
= (-3Cb
ab
+ 101Cb
cd
+ 33Cb
ef
-3Cb
gh
)/128
Cr’
d
= (-3Cr
ab
+ 101Cr
cd
+ 33Cr
ef
-3Cr
gh
)/128
Cb’
w
= (-3Cb
st
+ 33Cb
uv
+ 101Cb
wx
-3Cb
yz
)/128
Cr’
w
= (-3Cr
st
+ 33Cr
uv
+ 101Cr
wx
-3Cr
yz
)/128
Cb’
x
= (-3Cb
uv
+ 101Cb
wx
+ 33Cb
yz
-3Cb
yz
)/128
Cr’
x
= (-3Cr
uv
+ 101Cr
wx
+ 33Cr
yz
-3Cr
yz
)/128
Cb’
y
= (-3Cb
uv
+ 33Cb
wx
+ 101Cb
yz
-3Cb
yz
)/128
Cr’
y
= (-3Cr
uv
+ 33Cr
wx
+ 101Cr
yz
-3Cb
yz
)/128
Cb’
z
= (-3Cb
wx
+ 101Cb
yz
+ 33Cb
yz
-3Cb
wz
)/128
Cr’
z
= (-3Cr
wx
+ 101Cr
yz
+ 33Cr
yz
-3Cb
wx
)/128
Leading edge
replicated chroma
samples
4.5AncillaryDataDisplay
4.5.1HorizontalAncillary(HANC)DataDisplay
4.5.2VerticalAncillary(VANC)DataDisplay
4.6RawDataDisplayMode
AncillaryDataDisplay
Figure4-20.InterspersedChromaEdgeReplication
Thefollowingsectionsdiscussancillarydatadisplay.Nospecialprovisionsaremadeforthedisplayof
horizontalancillary(HANC)orverticalancillary(VANC),alsocalledverticalblankinginterval(VBI),data.
HANCdatacanbedisplayedusingthenormalvideodisplaymechanismbyprogrammingIMGHSIZEnto
occurpriortotheSAVcode.TheHANCdataincludingtheancillarydataheadermustbepartofthe
YCbCrseparateddataintheFIFOs.TheVCTHRLDvalueandEDMAsizemustbeprogrammedto
comprehendtheadditionalsamples.Youmustdisablescalingandchromare-samplingwhenincludingthe
displayofHANCdatatopreventdatacorruption.
VANC(orVBI)dataiscommonlyusedforsuchfeaturesasteletextandclosed-captioning.Nospecial
provisionsaremadeforthedisplayofVBIdata.VBIdatamaybedisplayedusingthenormaldisplay
mechanismbyprogrammingIMGVOFFtooccurbeforethefirstlineofactivevideoonthefirstlineof
desiredVBIdata.NotethattheVBIdatamustbeYCbCrseparated.Youmustdisablescalingandchroma
re-samplingwhenthedisplayofVBIdataisdesiredorthedatawillbecorruptedbythefilters.
TherawdatadisplaymodesareintendedtooutputdatatoaRAMDACorotherD/A-typedevice.Thisis
typicallyRGBformatteddata.Notiminginformationisinsertedintotheoutputdatastream;instead,
selectablecontrolsignalsareoutputtoindicatetiming.Rawdatadisplayincludesasynchronizeddual
channeloption.ThisallowschannelBtooutputaseparatedatastreamusingthesameclockandcontrol
aschannelA.Thismodeisusefulwhenusedwithasecondvideoportinsystemsthatrequire24-bitRGB
output.
TherawdatamodeusesasingleFIFOof5120bytesforstorageofoutputdata.TheFIFOisfilledby
EDMAswritingtotheYFIFOdestinationregisterA(YDSTA).EDMAsarerequestedusingtheYEVTA
event.Inrawsyncmode(RSYNCbitisset),theFIFOissplitinto2560-bytechannelAandBbuffers.The
channelBFIFOisfilledbyEDMAsusingtheYFIFOdestinationregisterB(YDSTB)asadestination.
BothYEVTAandYEVTBeventsaregeneratedusingthechannelAtimingcontrol.
106VideoDisplayPortSPRUEM1–May2007
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