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5
FLCOUNT
750
716
716
ILCOUNT
Field 1 Blanking
Field 1 Blanking
Field 1 Active
4
3
2
1
716
716
716
716
25
26
27
716
716
716
745
746
747
748
749
716
716
716
716
716
28
29
Field 1 Image
744
1
2
716
715
V F
01
01
01
01
01
01
01
00
00
00
01
01
01
01
716
EAV
00
00
00
00
00
6 716 01
750 716 01
Active
Horizontal
Output
Blanking Value
Blanking Value
Blanking Value
Blanking Value
Blanking Value
Blanking Value
Blanking Value
Blanking Value
Default Value
(B)
Default Value
(B)
Default Value
(B)
FIFO Data
FIFO Data
FIFO Data
FIFO Data
Default Value
(B)
Blanking Value
Blanking Value
Blanking Value
Blanking Value
Blanking Value
1
716
716
01
01
Blanking Value
Blanking Value
FLD
VBLNK
(A)(B)
VSYNC
(A)(B)
DisplayTimingExamples
TheverticaloutputtimingisshowninFigure4-30.SMPTE296Mhasasingleactivefield1thatis
720-lineshigh.Thisexampleshowsthe716-lineimagewindowwithanIMGVOFFnof3linesandalso
resultsinanon-datalineattheendofthefield.
TheVBLNKandVSYNCsignalsareshownastheywouldbeoutputforactive-lowoperation.Notethat
onlyoneofthetwosignalsisactuallyavailableexternally.TheVBLNKandVSYNCedgesoccuratthe
endofanactivelinesotheirXSTART/XSTOPvaluesaresetto1280(startofblanking).Thefield2
verticaltimingstartandstopregistersareprogrammedtoavaluegreaterthan750.Sincethisvalueis
neverreachedbyFLCOUNT,noextraVBLNKorVSYNCtransitionsoccur.FortrueSMPTE296M
operation,neitherVBLNKnorVSYNCwouldbeused.
TheFLDoutputissetuptotransitionlowatthestartofeachframe.SincetheFLD2YSTARTvalueis
neverreachedbyFLCOUNT,theFLDoutputremainsalwayslow.
TheILCOUNToperationfollowsthedescriptioninSection4.1.2.ILCOUNTresetsto1atthefirst
displayedline(FLCOUNT=VBLNKSTOPx+IMGVOFFn)andstopscountingatthelastdisplayedpixel
(IPCOUNT=IMGVSIZEx).Theoperationduringnon-displaytimeisnotarequirement,itcouldcontinue
countinguntilthenextFLCOUNT=VBLNKSTOPx+IMGVOFFnpointoritcouldresetimmediatelyafter
IMGVSIZExorwhenFLCOUNTisreset.
Theactivehorizontaloutputcolumnshowstheoutputdataduringtheactiveportionofthehorizontalline.
ItisassumedthattheDVENbitinVDCTLissettoenablethedefaultoutput.
Figure4-30.Y/CProgressiveDisplayVerticalTimingExample
AAssumesVCT1PbitinVPCTLissetto1(active-lowoutput).VSYNCoutputwhenVCTL2SbitinVDCTLissetto00,
VBLNKoutputwhenVCTL2Sbitisset01.
BIfDVENbitinVDCTLissetto1;otherwise,blankingvalueisoutput
VideoDisplayPort 118SPRUEM1–May2007
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