Texas Instruments TMS320DM648 Video Capture Port, BT.656 and Y/C Mode Field and Frame Operation

SPRUEM1 – May 2007

Video Capture Port

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, an EDMA 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 EDMAs 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		Page
3.1	Video Capture Mode Selection	46
3.2	BT.656 Video Capture Mode	46
3.3	Y/C Video Capture Mode	50
3.4	BT.656 and Y/C Mode Field and Frame Operation	51
3.5	Video Input Filtering	57
3.6	Ancillary Data Capture	60
3.7	Raw Data Capture Mode	61
3.8	TCI Capture Mode	63
3.9	Capture Line Boundary Conditions	67
3.10	Capturing Video in BT.656 or Y/C Mode	67
3.11	Capturing Video in Raw Data Mode	68
3.12	Capturing Data in TCI Capture Mode	69
3.13	Video Capture Registers	70
3.14	Video Capture FIFO Registers	91

SPRUEM1 –May 2007 Video Capture Port 45

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