Filter
Top Products
www.ti.com
3.13.3VideoCaptureChannelxField1StartRegister(VCxSTRT1)
VideoCaptureRegisters
Table3-15.VideoCaptureChannelAControlRegister(VCACTL)FieldDescriptions(continued)
Description
Bitfield
(1)
symval
(1)
ValueBT.656orY/CModeRawDataModeTCIMode
7CON
(2)
OF(value)Continuouscaptureenablebit.
DEFAULT0Continuouscaptureisdisabled.
DISABLE
ENABLE1Continuouscaptureisenabled.
6FRAME
(2)
OF(value)Captureframe(data)bit.
DEFAULT0Donotcaptureframe.DonotcapturesingleDonotcapturesingle
datablock.packet.
NONE
FRMCAP1Captureframe.CapturesingledataCapturesinglepacket.
block.
5CF2
(2)
OF(value)Capturefield2bit.
NONE0Donotcapturefield2.Donotcapturefield2.Notused.
DEFAULT1Capturefield2.Capturefield2.Notused.
FLDCAP
4CF1
(2)
OF(value)Capturefield1bit.
NONE0Donotcapturefield1.Donotcapturefield1.Notused.
DEFAULT1Capturefield1.Capturefield1.Notused.
FLDCAP
3Reserved-0Reserved.Thereservedbitlocationisalwaysreadas0.Avaluewrittentothis
fieldhasnoeffect.
2-0CMODEOF(value)0-7hCapturemodeselectbit.
DEFAULT0Enables8-bitBT.656mode.Notused.
BT656B
RAWB2hEnables8-bitrawdatamode.8-bitTCImode.
YCB4hEnables16-bitY/Cmode.Notused.
RAW166hEnables16-bitrawmode.Notused.
(2)
Forcompleteencodingofthesebits,seeTable3-6,Table3-11,andTable3-12.
Thecapturedimageisasubsetoftheincomingimage.Thevideocapturechannelxfield1startregister
(VCASTRT1,VCBSTRT1)definesthestartofthefield1capturedimage.Notethatthesizeisdefined
relativetoincomingdata(beforescaling).
InBT.656orY/Cmodes,thehorizontal(pixel)counterisreset(to0)bythehorizontalevent(asselected
bytheHRSTbitinVCxCTL)andthevertical(line)counterisreset(to1)bytheverticalevent(asselected
bytheVRSTbitinVCxCTL).Field1capturestartswhenHCOUNT=VCXSTART,VCOUNT=
VCYSTART,andfield1captureisenabled.
Inrawcapturemode,theVCVBLNKPbitsdefinestheminimumverticalblankingperiod.IfCAPENstays
de-assertedlongerthanVCVBLNKPclocks,thenaverticalblankingintervalisconsideredtohave
occurred.IftheSSEbitissetwhenthecapturefirstbegins(theVCENbitissetinVCxCTL),thecapture
doesnotstartuntiltwointervalsarecounted.Thisallowsthevideoporttosynchronizeitscapturetothe
topofaframewhenfirststarted.
InTCIcapturemode,thecapturestartswhentheCAPENsignalisasserted,theFRMCbit(inVCxSTAT)
iscleared,andaSYNCbyteisdetected.
Thevideocapturechannelxfield1startregister(VCxSTRT1)isshowninFigure3-23anddescribedin
Table3-16.
SPRUEM1–May2007VideoCapturePort75
SubmitDocumentationFeedback