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1.2.2VideoCaptureFIFOConfigurations
VDIN[9−2]
VDIN[19−12]
Capture FIFO A
Y Buffer A (1280 bytes)
Cb Buffer A (640 bytes)
8
8
64
64
Cb Buffer B (640 bytes)
Cr Buffer B (640 bytes)
CRSRCB
CBSRCB
8
8
8
8
CBSRCA
64
64
64
Capture FIFO B
Cr Buffer A (640 bytes)
YSRCB
CRSRCA
64
YSRCA
Y Buffer B (1280 bytes)
VideoPortFIFO
Duringvideocaptureoperation,thevideoportFIFOhasoneoffourconfigurationsdependingonthe
capturemode.ForBT.656operation,theFIFOissplitintochannelAandB,asshowninFigure1-2.Each
FIFOisclockedindependentlywiththechannelAFIFOreceivingdatafromtheVDIN[9-2]halfofthebus
andthechannelBFIFOreceivingdatafromtheVDIN[19-12]halfofthebus.Eachchannel'sFIFOis
furthersplitintoY,Cb,andCrbufferswithseparatewritepointersandreadregisters(YSRCx,CBSRCx,
andCRSRCx).
Figure1-2.BT.656VideoCaptureFIFOConfiguration
20OverviewSPRUEM1–May2007
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