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Raw Data Capture Mode
3.6.1 Horizontal Ancillary (HANC) Data Capture
No special provisions are made for the capture of HANC data. HANC data may be captured using the normal video capture mechanism by programming VCXSTRT to occur before the SAV (when HCOUNT is reset by the EAV code) or by programming VCXSTOP to occur past the EAV code (when HCOUNT is reset by the SAV code). Note that the EAV code and any subsequent HANC data will still be YCbCr separated. Software must parse the Y, Cb, and Cr memory buffers to determine any HANC data presence and to reconstruct the HANC data. The VCTHRLD value and EDMA size must be programmed to comprehend the additional samples. You must disable scaling and chroma
3.6.2 Vertical Ancillary (VANC) Data Capture
VANC (or VBI) data is commonly used for such features as teletext and
3.7Raw Data Capture Mode
In the raw data capture mode, the data is sampled by the interface only when the CAPEN signal is active. Data is captured at the rate of the sender'sclock, without any interpretation or start/stop of capture based on the data values.
To ensure initial capture synchronization to the beginning of a frame, an optional setup synchronization enable (SSE) bit is provided in VCxSTRT1. If the SSE bit is set, then when the VCEN bit is set to 1, the video port will not start capturing data until after detecting two vertical blanking intervals. If the SSE bit is cleared to 0, capture begins immediately when the VCEN bit is set.
The incoming digital video capture data is stored in the FIFO, which is
The captured data set size(image size) is set by VCxSTOPn. The VCXSTOP and VCYSTOP bits set the
The video port generates a YEVT after the specified number of new samples has been captured in the buffer. The number of samples required to generate YEVTx is programmable and is set in the VCTHRLDn bits of VCxTHRLD. On every YEVT, the EDMA should move data from the buffer to the DSP memory. When moving data from the buffer to the DSP memory, the EDMA should use the YSRCx location as a source address.
3.7.1 Raw Data Capture Notification
Raw data mode captures a single data packet of information using only CAPEN for control. Field information is available only for channel A operation using the FID input on VCTL3. If the RDFE bit in VCACTL is set, then the video port samples the FID input at the start of each data block (when DCOUNT
=0 and CAPENA is active) to determine the current field. In this case, the CON, FRAME, CF1, and CF2 bits in VCxCTL are used in a manner identical to BT.656 mode (see Section 3.4.1).
SPRUEM1 | Video Capture Port | 61 |