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4.12.12VideoDisplayField2ImageSizeRegister(VDIMGSZ2)
4.12.13VideoDisplayField1TimingRegister(VDFLDT1)
VideoDisplayRegisters
Thevideodisplayfield2imagesizeregister(VDIMGSZ2)definesthefield2imageareaandspecifiesthe
sizeofthedisplayedimagewithintheactivedisplay.
Theimagepixelcounter(IPCOUNT)countsdisplayedimagepixeloutputoneachofthedisplayedimage.
DisplayedimagepixeloutputstopswhenIPCOUNT=IMGHSIZE2.Thedefaultoutputvaluesorblanking
valuesareoutputfortheremainderoftheactiveline.
Theimagelinecounter(ILCOUNT)countsdisplayedimagelines.Displayedimageoutputstopswhen
ILCOUNT=IMGVSIZE2.Thedefaultoutputvaluesorblankingvaluesareoutputfortheremainderofthe
activefield.
Thevideodisplayfield2imagesizeregister(VDIMGSZ2)isshowninFigure4-42anddescribedin
Table4-17
Figure4-42.VideoDisplayField2ImageSizeRegister(VDIMGSZ2)
31282716
ReservedIMGVSIZE2
R-0R/W-0
1512110
ReservedIMGHSIZE2
R-0R/W-0
LEGEND:R/W=Read/Write;R=Readonly;-n=valueafterreset
Table4-17.VideoDisplayField2ImageSizeRegister(VDIMGSZ2)FieldDescriptions
Description
Bitfield
(1)
symval
(1)
ValueBT.656andY/CModeRawDataMode
31-28Reserved-0Reserved.Thereservedbitlocationisalwaysreadas0.Avaluewrittentothisfield
hasnoeffect.
27-16IMGVSIZE2OF(value)0-FFFhSpecifiesthedisplayimageheightinlines.
DEFAULT0
15-12Reserved-0Reserved.Thereservedbitlocationisalwaysreadas0.Avaluewrittentothisfield
hasnoeffect.
11-0IMGHSIZE2OF(value)0-FFFhSpecifiesthedisplayimagewidthinSpecifiesthedisplayimagewidthin
pixels.Thisnumbermustbeeven(thepixels.
LSBistreatedas0).
DEFAULT0
(1)
ForCSLimplementation,usethenotationVP_VDIMGSZ2_field_symval
Inrawdatamode,theFLDsignalisde-assertedtoindicatefield1displaywhenevertheframeline
counter(FLCOUNT)isequaltoFLD1YSTARTandtheframepixelcounter(FPCOUNT)isequalto
FLD1XSTART(thisisshowninFigure4-6.
InBT.656andY/Cmode,theFLDsignalisde-assertedtoindicatefield1displaywheneverFLCOUNT=
FLD1YSTARTandFPCOUNT=FLD1XSTART.TheFLDoutputiscompletelyindependentofthetiming
controlcodes.TheFbitintheEAV/SAVcodesiscontrolledbytheVDFBITregister.
Thevideodisplayfield1timingregister(VDFLDT1)setsthetimingofthefieldidentificationsignal.The
VDFLDT1isshowninFigure4-43anddescribedinTable4-18.
SPRUEM1–May2007VideoDisplayPort135
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