Co-siting

Relates to SMPTE 125M component digital video, in which the luminance
component (Y) is sampled four times for every two samples of the two chrominance
components (Cb and Cr). Co-siting refers to delaying transmission of the Cr component
to occur at the same time as the second sample of luminance data. This produces a
sampling order as follows: Y1/Cb1, Y2/Cr1, Y3/Cr3, Y4/Cb3, and so on. Co-siting
reduces required bus width from 30 bits to 20 bits.