SPRUIE9D May 2017 – May 2024 DRA74P , DRA75P , DRA76P , DRA77P
When DISCRETE_BASIC_MODE=‘0’, VBLNK is generally used. All the lines where the start of line is under an active VBLNK are sent to the Ancillary Data buffer. All the lines where the start of line is not under an active VBLNK are sent to the Active Video framebuffer. This situation is shown in Figure 11-67.
Figure 11-67 Ancillary and Active Video Line DeterminationThe start of line is the pixel represented by the inactive to active transition on HSYNC when USE_ACTVID_HSYNC_N = ‘1’. Figure 11-68 illustrates the delineation of a line when using USE_ACTVID_HSYNC_N = ‘1.’
Figure 11-68 HSYNC Pixel CaptureThe start of line is the pixel represented by the inactive to active transition on ACTVID when USE_ACTVID_HSYNC_N = ‘0.’ Note that ACTVID stays active for the entire duration of active video portion of the line. This scenario is shown in Figure 11-69
Figure 11-69 ACTVID Pixel CaptureIn 8-bit mode, the 4:2:2 YUV input color component order is Cb, Y followed by Cr and Y. For 16-bit and 24-bit input modes, all the components are sent in the same cycle.