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4.12.9VideoDisplayField1ImageOffsetRegister(VDIMGOFF1)
VideoDisplayRegisters
Thevideodisplayfield1imageoffsetregister(VDIMGOFF1)definesthefield1imageoffsetandspecifies
thestartinglocationofthedisplayedimagerelativetothestartoftheactivedisplay.
Theimagelinecounter(ILCOUNT)isresetto1onthefirstimageline(whenFLCOUNT=
VBLNKYSTOP1+IMGVOFF1).IftheNVbitisset,ILCOUNTisresetto1whenFLCOUNT=
VBLNKYSTOP1-IMGVOFF1.Displayimagepixelsareoutputinfield1beginningonthelinewhere
ILCOUNT=1.Thedefaultoutputvaluesorblankingvaluesareoutputduringactivelinespriorto
ILCOUNT=1.Foranegativeoffset,IMGVOFF1mustnotbegreaterthanVBLNKYSTOP1.Thefield1
activeimagemustnotoverlapthefield2activeimage.
Theimagepixelcounter(IPCOUNT)isresetto0atthestartofanactivelineimage.OnceILCOUNT=1,
imagepixelsfromtheFIFOareoutputoneachlineinfield1beginningwhenFPCOUNT=IMGHOFF1.If
theNHbitisset,IPCOUNTisresetwhenFPCOUNT=FRMWIDTH-IMGHOFF1.Thedefaultoutput
valuesorblankingvaluesareoutputduringactivepixelspriortoIMGHOFF1.
Thevideodisplayfield1imageoffsetregister(VDIMGOFF1)isshowninFigure4-39anddescribedin
Table4-14.
Figure4-39.VideoDisplayField1ImageOffsetRegister(VDIMGOFF1)
3130282716
NVReservedIMGVOFF1
R/W-0R-0R/W-0
151412110
NHReservedIMGHOFF1
R/W-0R-0R/W-0
LEGEND:R/W=Read/Write;R=Readonly;-n=valueafterreset
Table4-14.VideoDisplayField1ImageOffsetRegister(VDIMGOFF1)FieldDescriptions
Description
Bitfield
(1)
symval
(1)
ValueBT.656andY/CModeRawDataMode
31NVOF(value)Negativeverticalimageoffsetenablebit.
DEFAULT0Notused.
NONE
NEGOFF1DisplayimagewindowbeginsbeforetheNotused.
firstactivelineoffield1.(UsedforVBI
dataoutput.)
30-28Reserved-0Reserved.Thereservedbitlocationisalwaysreadas0.Avaluewrittentothisfield
hasnoeffect.
27-16IMGVOFF1OF(value)0-FFFhSpecifiesthedisplayimageverticaloffsetinlinesfromthefirstactivelineoffield1.
DEFAULT0
15NHOF(value)Negativehorizontalimageoffset.
DEFAULT0Notused.
NONE
NEGOFF1DisplayimagewindowbeginsbeforetheNotused.
startofactivevideo.(UsedforHANC
dataoutput.)
14-12Reserved-0Reserved.Thereservedbitlocationisalwaysreadas0.Avaluewrittentothisfield
hasnoeffect.
(1)
ForCSLimplementation,usethenotationVP_VDIMGOFF1_field_symval.
132VideoDisplayPortSPRUEM1–May2007
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