SPRUIE9D May 2017 – May 2024 DRA74P , DRA75P , DRA76P , DRA77P
Figure 11-64 shows VSYNC from Group 1 and ACTIVID(1) from Group 2 being used. ACTIVID is toggling during the VBLNK interval. ACTIVID does not necessarily toggle during VSYNC. Set USE_ACTVID_HSYNC_N=’1’ and DISCRETE_BASIC_MODE=’1’.
Also, no automatic parsing of vertical ancillary data will be performed so there is no activity on the Ancillary VPI port to the VPDMA. All lines, including both vertical ancillary and active video, will appear in the Video DRAM buffer. Lines starting after an inactive to active transition on VSYNC will delineate a start of frame. Lines are denoted by an inactive to active transition of ACTIVID. Only those pixels gated by an active ACTIVID will be saved.
Figure 11-64 VSYNC and ACTIVID(1)