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4.12.24VideoDisplayDefaultDisplayValueRegister(VDDEFVAL)
VideoDisplayRegisters
Figure4-53.VideoDisplayClippingRegister(VDCLIP)
31242316
CLIPCHIGHCLIPCLOW
R/W-1111-0000R/W-0001-0000
15870
CLIPYHIGHCLIPYLOW
R/W-1110-1011R/W-0001-0000
LEGEND:R/W=Read/Write;R=Readonly;-n=valueafterreset
Table4-28.VideoDisplayClippingRegister(VDCLIP)FieldDescriptions
Description
Bitfield
(1)
symval
(1)
ValueBT.656andY/CModeRawDataMode
31-24CLIPCHIGHOF(value)0-FFhACborCrvaluegreaterthanNotused.
CLIPCHIGHisforcedtotheCLIPCHIGH
value.
DEFAULTF0h
23-16CLIPCLOWOF(value)0-FFhACborCrvaluelessthanCLIPCLOWisNotused.
forcedtotheCLIPCLOWvalue.
DEFAULT10h
15-8CLIPYHIGHOF(value)0-FFhAYvaluegreaterthanCLIPYHIGHisNotused.
forcedtotheCLIPYHIGHvalue.
DEFAULTEBh
7-0CLIPYLOWOF(value)0-FFhAYvaluelessthanCLIPYLOWisforcedNotused.
totheCLIPYLOWvalue.
DEFAULT10h
(1)
ForCSLimplementation,usethenotationVP_VDCLIP_field_symval
Thevideodisplaydefaultdisplayvalueregister(VDDEFVAL)definesthedefaultvaluetobeoutputduring
theportionoftheactivevideowindowthatisnotpartofthedisplayedimage.
Thedefaultvalueisoutputduringthenon-imagedisplaywindowportionsoftheactivevideo.Thisisthe
regionbetweenILCOUNT=0andILCOUNT=IMGVOFFnvertically,andbetweenIPCOUNT=0and
IPCOUNT=IMGHOFFnhorizontally.InBT.656mode,CBDEFVAL,YDEFVAL,andCRDEFVALare
multiplexedontheoutputinthestandardCbYCrYmanner.InY/Cmode,YDEFVALisoutputonthe
VDOUT[9-2]busandCBDEFVALandCRDEFVALaremultiplexedontheVDOUT[19-12]bus.Inall
cases,thedefaultvaluesareoutputonthe8MSBsofthebus([9-2]or[19-12])andthe2LSBs([1-0]or
[11-10])aredrivenas0s.
Inrawdatamode,theleastsignificant8,10,16,or20bitsofDEFVALareoutputdependingonthebus
width.Thedefaultvalueisalsooutputduringthehorizontalandverticalblankingperiodsinrawdata
mode.
ThedefaultvalueisalsooutputduringtheentireactivevideoregionwhentheBLKDISbitinVDCTLisset
andtheFIFOisempty.
Thevideodisplaydefaultdisplayvalueregister(VDDEFVAL)isshowninFigure4-54fortheBT.656and
Y/CmodesandinFigure4-55fortherawdatamode,anddescribedinTable4-29.
SPRUEM1–May2007VideoDisplayPort143
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