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VideoDisplayRegisters
Thevideodisplayiscontrolledbythevideodisplaycontrolregister(VDCTL).
Thevideodisplaycontrolregister(VDCTL)isshowninFigure4-32anddescribedinTable4-7.
Figure4-32.VideoDisplayControlRegister(VDCTL)
313029282724
RSTCHBLKDISReservedPVPSYNReserved
R/WS-0R/W-1R-0R/W-0R-0
2322212019181716
FXSVXSHXSVCTL3SVCTL2SVCTL1S
R/W-0R/W-0R/W-0R/W-0R/W-0R/W-0
15141312111098
VDENReservedRGBXRSYNCDVENRESMPLReservedSCALE
R/W-0R-0R/W-0R/W-0R/W-0R/W-0R-0R/W-0
7654320
CONFRAMEDF2DF1ReservedDMODE
R/W-0R/W-0R/W-0R/W-0R-0R/W-0
LEGEND:R/W=Read/Write;R=Readonly;-n=valueafterreset
Table4-7.VideoDisplayControlRegister(VDCTL)FieldDescriptions
Description
Bitfield
(1)
symval
(1)
ValueBT.656andY/CModeRawDataMode
31RSTCHOF(value)Resetchannelbit.Write1toresetthebit,awriteof0hasnoeffect.01
DEFAULT0Noeffect.
NONE
RESET1Resetsthevideodisplaymoduleandsetsitsregisterstotheirinitialvalues.Also
clearstheVDENbit.ThevideodisplaymoduleautomaticallyclearsRSTCHafter
softwareresetiscompleted.
30BLKDISOF(value)Blockdisplayeventsbit.BLKDISfunctionsasadisplayFIFOresetwithoutaffecting
thecurrentprogrammableregistervalues.
Thevideodisplaymodulecontinuestofunctionnormally,thecounterscount,control
outputsaregenerated,EAV/SAVcodesaregeneratedforBT.656andY/Cmodes,
anddefaultorblankingdataisoutputduringactivedisplaytime.Nodataismovedto
thedisplayFIFOsbecausenoeventsoccur.TheF1D,F2D,andFRMDbitsin
VDSTATarestillsetwhenfieldsorframesarecomplete.
CLEAR0ClearingBLKDISdoesnotenableEDMAeventsduringthefieldinwhichthebitis
cleared.EDMAeventsareenabledatthestartofthenextframeaftertheonein
whichthebitiscleared.ThisallowstheEDMAtoalwaysbesyncedtotheproper
field.
DEFAULT1BlocksEDMAeventsandflushesthedisplayFIFOs.
BLOCK
29Reserved-0Thereservedbitlocationisalwaysreadas0.Avaluewrittentothisfieldhasno
effect.
28PVPSYNOF(value)Previousvideoportsynchronizationenablebit.0
DEFAULT0
DISABLE
ENABLE1Outputtimingislockedtoprecedingvideoport(VP2islockedtoVP1orVP1is
lockedtoVP0,seeFigure4-7.
27-24Reserved-0Reserved.Thereservedbitlocationisalwaysreadas0.Avaluewrittentothisfield
hasnoeffect.
(1)
ForCSLimplementation,usethenotationVP_VDCTL_field_symval
124VideoDisplayPortSPRUEM1–May2007
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