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4.12.5VideoDisplayField1VerticalBlankingStartRegister(VDVBLKS1)
VideoDisplayRegisters
Figure4-34.VideoDisplayHorizontalBlankingRegister(VDHBLNK)
31282716
ReservedHBLNKSTOP
R-0R/W-0
151412110
HBDLAReservedHBLNKSTART
R/W-0R-0R/W-0
LEGEND:R/W=Read/Write;R=Readonly;-n=valueafterreset
Table4-9.VideoDisplayHorizontalBlankingRegister(VDHBLNK)FieldDescriptions
Description
Bitfield
(1)
symval
(1)
ValueBT.656andY/CModeRawDataMode
31-28Reserved-0Reserved.Thereservedbitlocationisalwaysreadas0.Avaluewrittentothis
fieldhasnoeffect.
27-16HBLNKSTOPOF(value)0-FFFhLocationofSAVcodeandHBLNKEndingpixel(FPCOUNT)ofblanking
inactiveedgewithintheline.HBLNKvideoarea(HBLNKinactive)withinthe
inactiveedgemaybeoptionallyline.
delayedby4VCLKs.
DEFAULT0
15HBDLAOF(value)Horizontalblankingdelayenablebit.
DEFAULT0Horizontalblankingdelayisdisabled.Notused.
NONE
DELAY1HBLNKinactiveedgeisdelayedby4Notused.
VCLKs.
14-12Reserved-0Reserved.Thereservedbitlocationisalwaysreadas0.Avaluewrittentothis
fieldhasnoeffect.
11-0HBLNKSTARTOF(value)0-FFFhLocationofEAVcodeandHBLNKStartingpixel(FPCOUNT)ofblanking
activeedgewithintheline.videoarea(HBLNKactive)withinthe
line.
DEFAULT0
(1)
ForCSLimplementation,usethenotationVP_VDHBLNK_field_symval
Inrawdatamode,VBLNKisassertedwhenevertheframelinecounter(FLCOUNT)isequalto
VBLNKYSTART1andtheframepixelcounter(FPCOUNT)isequaltoVBLNKXSTART1(thisisshownin
Figure4-6).
InBT.656andY/Cmode,VBLNKisassertedwheneverFLCOUNT=VBLNKYSTART1andFPCOUNT=
VBLNKXSTART1.ThisVBLNKoutputcontroliscompletelyindependentofthetimingcontrolcodes.The
VbitintheEAV/SAVcodesforfield1iscontrolledbytheVDVBIT1register.
Thevideodisplayfield1verticalblankingstartregister(VDVBLKS1)controlsthestartofverticalblanking
infield1.
Thevideodisplayfield1verticalblankingstartregister(VDVBLKS1)isshowninFigure4-35and
describedinTable4-10.
VideoDisplayPort 128SPRUEM1–May2007
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