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Video capture works by sampling video data on the input pins and saving it to
the video port FIFO. When the amount of captured data reaches a
programmed threshold level, a DMA is performed to move data from the FIFO
into DSP memory. In some cases, color separation is performed on the incoming
video data requiring multiple FIFOs and DMAs to be used.
The video port enables capture of both interlaced and progressive scan data.
Interlaced capture can be performed on either a field-by-field or a frame-by-
frame basis. A capture window specifies the data to be captured within each
field. Frame and field synchronization can be performed using embedded sync
codes or configurable control inputs allowing glueless interface to various
encoders and ADCs.
Topic
3.1
Video Capture Mode Selection
3.2
BT.656 Video Capture Mode
3.3
Y/C Video Capture Mode
3.4
BT.656 and Y/C Mode Field and Frame Operation
3.5
Video Input Filtering
3.6
Ancillary Data Capture
3.7
Raw Data Capture Mode
3.8
TSI Capture Mode
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3.9
Capture Line Boundary Conditions
3.10 Capturing Video in BT.656 or Y/C Mode
3.11 Capturing Video in Raw Data Mode
3.12 Capturing Data in TSI Capture Mode
3.13 Video Capture Registers
3.14 Video Capture FIFO Registers
Video Capture Port
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Chapter 3
Page
3-2
3-3
3-12
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3-17
3-26
3-31
3-32
3-37
3-42
3-44
3-46
3-47
3-49
3-83
3-1
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