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3.13.5VideoCaptureChannelxField2StartRegister(VCxSTRT2)
VideoCaptureRegisters
Figure3-24.VideoCaptureChannelxField1StopRegister(VCxSTOP1)
31282716
ReservedVCYSTOP
R-0R/W-0
1512110
ReservedVCXSTOP
R-0R/W-0
LEGEND:R/W=Read/Write;R=Readonly;-n=valueafterreset
Table3-17.VideoCaptureChannelxField1StopRegister(VCxSTOP1)FieldDescriptions
Description
Bitfield
(1)
symval
(1)
ValueBT.656orY/CModeRawDataModeTCIMode
31-28Reserved-0Reserved.Thereservedbitlocationisalwaysreadas0.Avaluewrittentothis
fieldhasnoeffect.
27-16VCYSTOPOF(value)0-FFFhLastcapturedline.Upper12bitsoftheUpper12bitsofthe
datasize(indatadatasize(indata
samples).samples).
DEFAULT0
15-12Reserved-0Reserved.Thereservedbitlocationisalwaysreadas0.Avaluewrittentothis
fieldhasnoeffect.
11-0VCXSTOPOF(value)0-FFFhLastcapturedpixel(VCXSTOPLower12bitsoftheLower12bitsofthe
-1).Mustbeanevenvaluedatasize(indatadatasize(indata
(theLSBistreatedas0).samples).samples).
DEFAULT0
(1)
ForCSLimplementation,usethenotationVP_VCxSTOP1_field_symval
Thecapturedimageisasubsetoftheincomingimage.Thevideocapturechannelxfield2startregister
(VCASTRT2,VCBSTRT2)definesthestartofthefield2capturedimage.(Thisallowsdifferentwindow
alignmentorsizeforeachfield.)Notethatthesizeisdefinedrelativetoincomingdata(beforescaling).
InBT.656orY/Cmodes,thehorizontal(pixel)counterisresetbythehorizontalevent(asselectedbythe
HRSTbitinVCxCTL)andthevertical(line)counterisresetbytheverticalevent(asselectedbytheVRST
bitinVCxCTL).Field2capturestartswhenHCOUNT=VCXSTART,VCOUNT=VCYSTART,andfield2
captureisenabled.
TheseregistersarenotusedinrawdatamodeorTCImodebecausetheircapturesizesarecompletely
definedbythefield1startandstopregisters.
Thevideocapturechannelxfield2startregister(VCxSTRT2)isshowninFigure3-25anddescribedin
Table3-18.
Figure3-25.VideoCaptureChannelxField2StartRegister(VCxSTRT2)
31282716
ReservedVCYSTART
R-0R/W-0
1512110
ReservedVCXSTART
R-0R/W-0
LEGEND:R/W=Read/Write;R=Readonly;-n=valueafterreset
SPRUEM1–May2007VideoCapturePort77
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