Texas Instruments TMS320DM648 Computer Drive User Manual


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525
2
1
4
3
6
5
19
Field1active
Field1image
20
21
22
23
262
263
264
265
266
267
268
269
282
Field2active
283
284
285
286
Field2image
524
525
1
Field1blanking
1
2
1
2
239
240
240
240
240
240
240
240
240
240
240
240
240
240
240
239
240
240
240
240
240
240
240
240
240
240
240
240
ILCOUNTFLCOUNT
0 1
11
1 1
1 1
1 0
1 0
1 0
01
00
0 0
0
0
0
0
0 0
00
0 0
0 0
1 0
1 0
1 1
1 1
1 1
1 1
1 1
0 1
0 1
0 1
0 1
0 1
0 0
0 1
1 1
1 1
EAV
V F
FLD
VBLNK
AB
VSYNC
AB
Active
horizontal
output
FIFOdata
FIFOdata
Blankingvalue
Blankingvalue
Blankingvalue
Blankingvalue
Blankingvalue
Blankingvalue
Blankingvalue
Blankingvalue
Defaultvalue§
Defaultvalue§
Defaultvalue§
FIFOdata
FIFOdata
Defaultvalue§
Blankingvalue
Blankingvalue
Blankingvalue
Blankingvalue
Blankingvalue
Blankingvalue
Blankingvalue
Defaultvalue§
Defaultvalue§
Defaultvalue§
FIFOdata
FIFOdata
FIFOdata
FIFOdata
Blankingvalue
Blankingvalue
IMGVOFF1=3
IMGVSIZE1=240
IMGVOFF2=3
IMGVSIZE2=240
FRMHEIGHT =525
VBITSET1=1
VBITCLR1=20
VBITSET2=264
VBITCLR2=283
VBLNKXSTART1=720
VBLNKYSTART1=1
VBLNKXSTOP1-720
VBLNKYSTOP1-20
VBLNKXSTAR2=360
VBLNKYSTART2=263
VBLNKXSTOP2=360
BLNKYSTOP2=283
VSYNCXSTART1=720
VSYNCYSTART1=4
VSYNCXSTOP1=720
VSYNCYSTOP1=7
VSYNCXSTART2=360
VSYNCYSTART2=266
VSYNCXSTOP2=360
VSYNCYSTOP2=269
FLD1XSTART =720
FLD1YSTART =1
FLD2XSTART =360
FLD2YSTART =263
FBITSET =266
FBITCLR=4
Field2blanking
4.9.2InterlacedRawDisplayExample
DisplayTimingExamples
Figure4-26.BT.656InterlacedDisplayVerticalTimingExample
AAssumesVCT1PbitinVPCTLissetto1(active-lowoutput).VSYNCoutputwhenVCTL2SbitinVDCTLissetto00,
VBLNKoutputwhenVCTL2Sbitisset01.
BIfDVENbitinVDCTLissetto1;otherwise,blankingvalueisoutput.
Thissectionshowsanexampleofrawdisplayoutputforthesame704x408interlacedimage.
ThehorizontaloutputtimingisshowninFigure4-27.ThisdiagramassumesthatthereisatwoVCLK
pipelinedelaybetweentheinternalcounterchangingandtheoutputonexternalpins.Theactualdelay
canbelongerorshorteraslongasitisconsistentwithinanydisplaymode.Theactivelineis720-pixels
wide.Figure4-27showsthe704-pixelimagewindowcenteredinthescreenthatresultsinanIMGHOFFx
of8pixels.
TheHBLNKandHSYNCsignalsareshownastheywouldbeoutputforactive-lowoperation.Notethat
onlyoneofthetwosignalsisactuallyavailableexternally.TheHBLNKinactiveedgeoccursonsample0.
TheIPCOUNToperationfollowsthedescriptioninSection4.1.2.IPCOUNTresetsto0atthefirst
displayedpixel(FPCOUNT=IMGHOFFx)andstopscountingatthelastdisplayedpixel(IPCOUNT=
IMGHSIZEx).BoththeIPCOUNTandFPCOUNTcountersincrementoneverythirdVCLKINrisingedge,
asprogrammedbytheINCPIXbitsinVDTHRLDwithavalueof3.
VDOUTshowstheoutputdataandswitchingbetweenDefaultData,andFIFOData.Threevaluesare
outputsequentiallyonVDOUTforeachpixelcount.Notethatthedefaultvalueisoutputduringboththe
blankingandnon-displayimageactivevideoregions.
SPRUEM1–May2007VideoDisplayPort113
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