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4.12.7VideoDisplayField2VerticalBlankingStartRegister(VDVBLKS2)
VideoDisplayRegisters
Table4-11.VideoDisplayField1VerticalBlankingEndRegister(VDVBLKE1)FieldDescriptions
Description
Bitfield
(1)
symval
(1)
ValueBT.656andY/CModeRawDataMode
31-28Reserved-0Reserved.Thereservedbitlocationisalwaysreadas0.Avaluewrittentothis
fieldhasnoeffect.
27-16VBLNKYSTOP1OF(value)0-FFFhSpecifiestheline(inFLCOUNT)whereSpecifiestheline(inFLCOUNT)where
VBLNKinactiveedgeoccursforfield1.verticalblankingends(VBLNKinactive
DoesnotaffectEAV/SAVVbitedge)forfield1.
operation.
DEFAULT0
15-12Reserved-0Reserved.Thereservedbitlocationisalwaysreadas0.Avaluewrittentothis
fieldhasnoeffect.
11-0VBLNKXSTOP1OF(value)0-FFFhSpecifiesthepixel(inFPCOUNT)Specifiesthepixel(inFPCOUNT)
whereVBLNKinactiveedgeoccursforwhereverticalblankingends(VBLNK
field1.inactiveedge)forfield1.
DEFAULT0
(1)
ForCSLimplementation,usethenotationVP_VDVBLKE1_field_symval
Thevideodisplayfield2verticalblankingstartregister(VDVBLKS2)controlsthestartofverticalblanking
infield2.
Inrawdatamode,VBLNKisassertedwhenevertheframelinecounter(FLCOUNT)isequalto
VBLNKYSTART2andtheframepixelcounter(FPCOUNT)isequaltoVBLNKXSTART2(thisisshownin
Figure4-6.
InBT.656andY/Cmode,VBLNKisassertedwheneverFLCOUNT=VBLNKYSTART2andFPCOUNT=
VBLNKXSTART2.ThisVBLNKoutputcontroliscompletelyindependentofthetimingcontrolcodes.The
VbitintheEAV/SAVcodesforfield2iscontrolledbytheVDVBIT2register.
Thevideodisplayfield2verticalblankingstartregister(VDVBLKS2)isshowninFigure4-37and
describedinTable4-12.
Figure4-37.VideoDisplayField2VerticalBlankingStartRegister(VDVBLKS2)
31282716
ReservedVBLNKYSTART2
R-0R/W-0
1512110
ReservedVBLNKXSTART2
R-0R/W-0
LEGEND:R/W=Read/Write;R=Readonly;-n=valueafterreset
Table4-12.VideoDisplayField2VerticalBlankingStartRegister(VDVBLKS2)FieldDescriptions
Description
Bitfield
(1)
symval
(1)
ValueBT.656andY/CModeRawDataMode
31-28Reserved-0Reserved.Thereservedbitlocationisalwaysreadas0.Avaluewrittentothis
fieldhasnoeffect.
27-16VBLNKYSTART2OF(value)0-FFFhSpecifiestheline(inFLCOUNT)whereSpecifiestheline(inFLCOUNT)where
VBLNKactiveedgeoccursforfield2.verticalblankingbegins(VBLNKactive
DoesnotaffectEAV/SAVVbitedge)forfield2.
operation.
DEFAULT0
15-12Reserved-0Reserved.Thereservedbitlocationisalwaysreadas0.Avaluewrittentothis
fieldhasnoeffect.
(1)
ForCSLimplementation,usethenotationVP_VDVBLKS2_field_symval
130VideoDisplayPortSPRUEM1–May2007
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