SPRUIE9D May 2017 – May 2024 DRA74P , DRA75P , DRA76P , DRA77P
In this style of Discrete Sync, as shown in Figure 11-33, four pins are used including the Pixel Clock. HSYNC signals the beginning of the line. All data in the line is captured, including Horizontal Blanking Data. In fact, this signaling mode is the only one which allows Horizontal Blanking Data to be captured.
Of course, by capturing the horizontal blanking pixels in the frame buffers, there is no way to be certain exactly where the blanking ends and the active video starts. One would have to rely solely on video format specs to find the active video inside the frame buffer.