SPRUI30H November 2015 – May 2024 DRA745 , DRA746 , DRA750 , DRA756
Figure 9-63 shows VSYNC from Group 1 and HBLINK from Group 2 being used. Set USE_ACTVID_HSYNC_N=’0’ and DISCRETE_BASIC_MODE=’1’.
Also, no automatic parsing of vertical ancillary data will be performed so the Ancillary VPI port to the VPDMA should be disabled. 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. Every data element strobed on the Pixel clock’s active edge will be stored in the Active Video Buffer.
In Figure 9-63, it is likely the HBLINK will toggle when VSYNC is active. In this case, setting USE_ACTVID_HSYNC_N=’0’ and DISCRETE_BASIC_MODE=’0’ mean that those lines appearing under the active VSYNC will be sent to the Ancillary Data Buffer. All other captured lines will be sent to the Active Video Buffer.