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4.9.3Y/CProgressiveDisplayExample
DisplayTimingExamples
Thissectionshowsanexampleofprogressivedisplayoperation.TheoutputformatfollowsSMPTE
296M-2001specificationsfora1280x720/60system.Theexampleisfora1264x716progressiveoutput
image.
ThehorizontaloutputtimingisshowninFigure4-29.ThisdiagramassumesthatthereisatwoVCLK
pipelinedelaybetweentheinternalcounterchangingandtheoutputonexternalpins.Theactualdelay
canbelongerorshorteraslongasitisconsistentwithinanydisplaymode.TheSMPTE296M60-Hz
activelineis1650-pixelswide.Figure4-29showsthe1264-pixelimagewindowcenteredinthescreen
thatresultsinanIMGHOFFxof8pixels.
TheHBLNKandHSYNCsignalsareshownastheywouldbeoutputforactive-lowoperation.Notethat
onlyoneofthetwosignalsisactuallyavailableexternally.TheHBLNKinactiveedgeoccurseitheron
sample1646coincidentwiththestartofSAVoronsample0(afterSAV)iftheHBDLAbitisset.Fortrue
SMPTE296Moperation,neitherHBLNKnorHSYNCwouldbeused.
TheIPCOUNToperationfollowsthedescriptioninSection4.1.2.IPCOUNTresetsto0atthefirst
displayedpixel(FPCOUNT=IMGHOFFx)andstopscountingatthelastdisplayedpixel(IPCOUNT=
IMGHSIZEx).Theoperationduringnon-displaytimeisnotarequirement,itcouldcontinuecountinguntil
thenextFPCOUNT=IMGHOFFxpointoritcouldresetimmediatelyafterIMGHSIZExorwhenFPCOUNT
isreset.
VDOUTshowstheoutputdataandswitchingbetweenEAV,BlankingData,SAV,DefaultData,andFIFO
Data.ItisassumedthattheDVENbitinVDCTLissettoenablethedefaultoutput.
116VideoDisplayPortSPRUEM1–May2007
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