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4.1VideoDisplayModeSelection
4.1.1ImageTiming
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VideoDisplayModeSelection
ThevideodisplaymoduleoperatesinoneofthreemodesaslistedinTable4-1.TheDMODEbitsarein
thevideodisplaycontrolregister(VDCTL).TheY/Cand16-bitrawdisplaymodesmayonlybeselectedif
theDCDISbitinthevideoportcontrolregister(VPCTL)isclearedto0.
Table4-1.VideoDisplayModeSelection
DMODEBitsModeDescription
0008-BitITU-RBT.656DisplayDigitalvideooutputisinYCbCr4:2:2with8-bitresolutionmultiplexedinITU-R
BT.656format.
0108-BitRawDisplay8-bitdataoutput
1008-BitY/CDisplayDigitalvideoisoutputinYCbCr4:2:2with8-bitresolutiononparallelYand
Cb/Crmultiplexedchannels.
11016-BitRawDisplay16-bitdataoutput.
Displaydevicesgenerateinterlacedimagesbycontrollingtheverticalretracetiming.Thevideodisplay
moduleemitsadatastreamusedtogenerateadisplayedimage.AnNTSC-compatibleinterlacedimage
withfieldandlineinformationisshowninFigure4-1.Aprogressive-scanimage(SMPTE296M
compatible)isshowninFigure4-2.
Theactivevideoarearepresentsthepixelsvisibleonthedisplay.Theactivevideoareabeginsafterthe
horizontalandverticalblankingintervals.Theimageareaoutputbythevideodisplaymodulecanbea
subsetoftheactivearea.Therelationshipbetweenframe,activevideoarea,andimageareaispresented
inFigure4-3forinterlacedvideoandinFigure4-4forprogressivevideo.Thevideodisplaymodule
generatestimingforframes,activevideoareaswithinframes,andimageswithintheactivevideoarea.
Figure4-1.NTSCCompatibleInterlacedDisplay
SPRUEM1–May2007VideoDisplayPort93
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