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4.12.28VideoDisplayField2VerticalBlankingBitRegister(VDVBIT2)
VideoDisplayRegisters
Table4-32.VideoDisplayField1VerticalBlankingBitRegister(VDVBIT1)FieldDescriptions
Description
Bitfield
(1)
symval
(1)
ValueBT.656andY/CModeRawDataMode
31-28Reserved-0Reserved.Thereservedbitlocationisalwaysreadas0.Avaluewrittentothisfield
hasnoeffect.
27-16VBITCLR1OF(value)0-FFFhSpecifiesthefirstlinewithanEAVofV=Notused.
0indicatingthestartoffield1active
display.
DEFAULT0
15-12Reserved-0Reserved.Thereservedbitlocationisalwaysreadas0.Avaluewrittentothisfield
hasnoeffect.
11-0VBITSET1OF(value)0-FFFhSpecifiesthefirstlinewithanEAVofV=Notused.
1indicatingthestartoffield1vertical
blanking.
DEFAULT0
(1)
ForCSLimplementation,usethenotationVP_VDVBIT1_field_symval
Thevideodisplayfield2verticalblankingbitregister(VDVBIT2)controlstheVbitintheEAVandSAV
timingcontrolwordsforfield2.TheVDVBIT2isshowninFigure4-59anddescribedinTable4-33.
TheVBITSET2andVBITCLR2bitscontroltheVbitvalueintheEAVandSAVtimingcontrolcodes.The
Vbitissetto1(indicatingthestartoffield2digitalverticalblanking)intheEAVcodeatthebeginningof
thelinewhenevertheframelinecounter(FLCOUNT)isequaltoVBITSET2.Itremainsa1forall
EAV/SAVcodesuntiltheEAVatthebeginningofthelineonwhenFLCOUNT=VBITCLR2whereit
changesto0(indicatingthestartofthefield2digitalactivedisplay).TheVbitoperationiscompletely
independentoftheVBLNKcontrolsignal.
Forcorrectinterlacedoperation,theregiondefinedbyVBITSET2andVBITCLR2mustnotoverlapthe
regiondefinedbyVBITSET1andVBITCLR1.Forprogressivescanoperation,VBITSET2andVBITCLR2
shouldbeprogrammedtoavaluegreaterthanFRMHEIGHT.
Figure4-59.VideoDisplayField2VerticalBlankingBitRegister(VDVBIT2)
31282716
ReservedVBITCLR2
R-0R/W-0
1512110
ReservedVBITSET2
R-0R/W-0
LEGEND:R/W=Read/Write;R=Readonly;-n=valueafterreset
Table4-33.VideoDisplayField2VerticalBlankingBitRegister(VDVBIT2)FieldDescriptions
Description
Bitfield
(1)
symval
(1)
ValueBT.656andY/CModeRawDataMode
31-28Reserved-0Reserved.Thereservedbitlocationisalwaysreadas0.Avaluewrittentothisfield
hasnoeffect.
27-16VBITCLR2OF(value)0-FFFhSpecifiesthefirstlinewithanEAVofV=Notused.
0indicatingthestartoffield2active
display.
DEFAULT0
15-12Reserved-0Reserved.Thereservedbitlocationisalwaysreadas0.Avaluewrittentothisfield
hasnoeffect.
(1)
ForCSLimplementation,usethenotationVP_VDVBIT2_field_symval
SPRUEM1–May2007VideoDisplayPort147
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