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4.12.3VideoDisplayFrameSizeRegister(VDFRMSZ)
4.12.4VideoDisplayHorizontalBlankingRegister(VDHBLNK)
VideoDisplayRegisters
Thevideodisplayframesizeregister(VDFRMSZ)setsthedisplaychannelframesizebysettingthe
endingvaluesfortheframelinecounter(FLCOUNT)andtheframepixelcounter(FPCOUNT).
TheFPCOUNTstartsat0andcountstoFRMWIDTH-1beforerestarting.TheFLCOUNTstartsat1and
countstoFRMHEIGHTbeforerestarting.
Thevideodisplayframesizeregister(VDFRMSZ)isshowninFigure4-33anddescribedinTable4-8.
Figure4-33.VideoDisplayFrameSizeRegister(VDFRMSZ)
31282716
ReservedFRMHEIGHT
R-0R/W-0
1512110
ReservedFRMWIDTH
R-0R/W-0
LEGEND:R/W=Read/Write;R=Readonly;-n=valueafterreset
Table4-8.VideoDisplayFrameSizeRegister(VDFRMSZ)FieldDescriptions
Bitfield
(1)
symval
(1)
ValueDescription
31-28Reserved-0Reserved.Thereservedbitlocationisalwaysreadas0.Avaluewrittentothisfield
hasnoeffect.
27-16FRMHEIGHTOF(value)0-FFFhDefinesthetotalnumberoflinesperframe.Thenumberistheendingvalueofthe
framelinecounter(FLCOUNT).
ForBT.656operation,theFRMHIGHTissetto525(525/60operation)or625
(625/50operation).
DEFAULT0
15-12Reserved-0Reserved.Thereservedbitlocationisalwaysreadas0.Avaluewrittentothisfield
hasnoeffect.
11-0FRMWIDTHOF(value)0-FFFhDefinesthetotalnumberofpixelsperlineincludingblanking.Thenumberisthe
framepixelcounter(FPCOUNT)endingvalue+1.
ForBT.656operation,theFRMWIDTHistypically858or864.
DEFAULT0
(1)
ForCSLimplementation,usethenotationVP_VDFRMSZ_field_symval
Thevideodisplayhorizontalblankingregister(VDHBLNK)controlsthedisplayhorizontalblanking.
Everytimetheframepixelcounter(FPCOUNT)isequaltoHBLNKSTART,HBLNKisasserted.
HBLNKSTARTalsodetermineswheretheEAVcodeisinsertedintheBT.656andY/Coutput.
EverytimeFPCOUNT=HBLNKSTOP,theHBLNKsignalisde-asserted(thisisshowninFigure4-5).In
BT.656andY/Cmodes,HBLNKSTOPdeterminestheSAVcodeinsertionpointandHBLNKde-assertion
point.TheHBLNKinactiveedgemayoptionallybedelayedby4pixelclocksusingtheHBDLAbit.
Thevideodisplayhorizontalblankingregister(VDHBLNK)isshowninFigure4-34anddescribedin
Table4-9
SPRUEM1–May2007VideoDisplayPort127
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