Texas Instruments TMS320DM648 Computer Drive User Manual


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YFIFO
CbFIFO
VDOUT[9−2]
VCLKOUT
63 5655 4847 4039 32
Y5 Y4Y7 Y6
Y69 Y68Y71 Y70
Y77 Y76
Cb37 Cb36Cb38
Little-EndianPacking
VDOUT[19−12]
31 2423 1615 8 7 0
Y1 Y0Y3 Y2
Y65 Y64Y67 Y66
Y73 Y72Y75 Y74
31 2423 1615 8 7 0
Cb33 Cb32Cb35 Cb34
63 5655 4847 4039 32
IPCOUNT =IMGSIZE(78)
Cb5 Cb4Cb7 Cb6 Cb1 Cb0Cb3 Cb2
Cr FIFO
Cr 37 Cr36Cr38
31 2423 1615 8 7 0
Cr33 Cr32Cr35 Cr34
63 5655 4847 4039 32
Cr5 Cr4Cr7 Cr6 Cr1 Cr0Cr3 Cr2
Linen
Linen
Linen+1
Linen
Linen+1
Linen
Linen+1
4.9DisplayTimingExamples
4.9.1InterlacedBT.656TimingExample
DisplayTimingExamples
Figure4-24.DisplayLineBoundaryExample
Thefollowingareexamplesofdisplayoutputforseveralmodesofoperation.
ThissectionshowsanexampleofBT.656displayoutputfora704x408interlacedoutputimageasmight
begeneratedbyMPEGdecoding.
ThehorizontaloutputtimingisshowninFigure4-25.ThisdiagramassumesthatthereisatwoVCLK
pipelinedelaybetweentheinternalcounterchangingandtheoutputonexternalpins.Theactualdelay
canbelongerorshorteraslongasitisconsistentwithinanydisplaymode.TheBT.656activelineis
720-pixelswide.Figure4-25showsthe704-pixelimagewindowcenteredinthescreenthatresultsinan
IMGHOFFxof8pixels.
TheHBLNKandHSYNCsignalsareshownastheywouldbeoutputforactive-lowoperation.Notethat
onlyoneofthetwosignalsisactuallyavailableexternally.TheHBLNKinactiveedgeoccurseitheron
sample856coincidentwiththestartofSAVoronsample0(afterSAV)iftheHBDLAbitisset.Fortrue
BT.656operation,neitherHBLNKnorHSYNCwouldbeused.
TheIPCOUNToperationfollowsthedescriptioninSection4.1.2.IPCOUNTresetsto0atthefirst
displayedpixel(FPCOUNT=IMGHOFFx)andstopscountingatthelastdisplayedpixel(IPCOUNT=
IMGHSIZEx).Theoperationduringnon-displaytimeisnotarequirement,itcouldcontinuecountinguntil
thenextFPCOUNT=IMGHOFFxpointoritcouldresetimmediatelyafterIMGHSIZExorwhenFPCOUNT
isreset.
VDOUTshowstheoutputdataandswitchingbetweenEAV,BlankingData,SAV,DefaultData,andFIFO
Data.ItisassumedthattheDVENbitinVDCTLissettoenablethedefaultoutput.
110VideoDisplayPortSPRUEM1–May2007
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