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data are delimited in the stream by 4-byte long SAV (Start of Active Video) and EAV (End of Active Video) code sequences. SAV codes also contain status bits indicating line position in a video field or frame. Line position in a full frame can be determined by tracking SAV status bits, allowing
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format. After an SAV code (4 bytes) is sent, the first 8 bits of Cb (chroma U) data are sent then 8 bits of Y (luma), followed by 8 bits of Cr (chroma V) for the next pixel and then 8 bits of Y. To reconstruct full resolution Y, Cb, Cr pixel values,
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values (the standard in consumer electronics) or 10-bit values (sometimes used in studio environments). Both a parallel and a serial transmission format are defined. For the parallel format, a 25-pin
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Recommendation ITU-R BT.656-5 - Interface for digital component video signals in 525-line and 625-line television systems operating at the 4:2:2 level of
Recommendation ITU-R BT.601
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The parallel version of the ITU-R BT.656 protocol is also used in many TV sets between chips using
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logic levels. Typical applications include the interface between a PAL/NTSC decoder chip and a
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digital video encoding parameters defined in ITU-R Recommendation
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Simple digital video protocol for standard-definition television
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color space and a 13.5 MHz sampling frequency for pixels.
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video data, streaming each field separately, and uses the
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A BT.656 data stream is a sequence of 8-bit or 10-bit
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The standard can be implemented to transmit either 8-
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receivers to 'synchronize' with an incoming stream.
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380:International Telecommunication Union
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