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4.12.22VideoDisplayEventRegister(VDDISPEVT)
4.12.23VideoDisplayClippingRegister(VDCLIP)
VideoDisplayRegisters
Thevideodisplayeventregister(VDDISPEVT)isprogrammedwiththenumberofEDMAeventstobe
generatedfordisplayfield1andfield2.
Thevideodisplayeventregister(VDDISPEVET)isshowninFigure4-52anddescribedinTable4-27.
Figure4-52.VideoDisplayEventRegister(VDDISPEVT)
31282716
ReservedDISPEVT2
R-0R/W-0
1512110
ReservedDISPEVT1
R-0R/W-0
LEGEND:R/W=Read/Write;R=Readonly;-n=valueafterreset
Table4-27.VideoDisplayEventRegister(VDDISPEVT)FieldDescriptions
Description
Bitfield
(1)
symval
(1)
ValueBT.656andY/CModeRawDataMode
31-28Reserved-0Reserved.Thereservedbitlocationisalwaysreadas0.Avaluewrittentothisfield
hasnoeffect.
27-16DISPEVT2OF(value)0-FFFhSpecifiesthenumberofEDMAeventSpecifiesthenumberofEDMAevents
sets(YEVT,CbEVT,CrEVT)tobe(YEVT)tobegeneratedforfield2
generatedforfield2output.output.
DEFAULT0
15-12Reserved-0Reserved.Thereservedbitlocationisalwaysreadas0.Avaluewrittentothisfield
hasnoeffect.
11-0DISPEVT1OF(value)0-FFFhSpecifiesthenumberofEDMAeventSpecifiesthenumberofEDMAevents
sets(YEVT,CbEVT,CrEVT)tobe(YEVT)tobegeneratedforfield1
generatedforfield1output.output.
DEFAULT0
(1)
ForCSLimplementation,usethenotationVP_VDDISPEVT_DISPEVTn_symval
ThevideodisplaymoduleintheBT.656andY/Cmodesperformsprogrammableclipping.Theclippingis
performedasthelaststepofthevideopipeline.Itisappliedonlyontheimageareasdefinedby
VDIMGSZnandVDIMGOFFninsidetheactivevideoarea(blankingvaluesarenotclipped).
VDCLIPallowsoutputvaluestobeclampedwithinthespecifiedvalues.Thedefaultvaluesarethe
BT.601-specifiedpeakblacklevelof16andpeakwhitelevelof235forlumaandthemaximum
quantizationlevelsof16and240forchroma.For10-bitoperation,theclippingisappliedtothe8MSBsof
thevaluewiththe2LSBscleared.(Forexample,aYvalueofFF.8hisclippedtoEB.0handaYvalueof
0F.4hisclippedto10.0h.)
Thevideodisplayclippingregister(VDCLIP)isshowninFigure4-53anddescribedinTable4-28.
VideoDisplayPort 142SPRUEM1–May2007
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