SPRUIE9D May 2017 – May 2024 DRA74P , DRA75P , DRA76P , DRA77P
Figure 11-66 shows VSYNC from Group 1 and HSYNC from Group 2 being used. Set USE_ACTVID_HSYNC_N=’0’ and DISCRETE_BASIC_MODE=’1’.
In the event that the machine is set to DISCRETE_BASIC_MODE=’0’, lockup will not occur as long as there is an HSYNC active transition during the time that VSYNC is active. This scenario is likely. However, if there is not at least one such transition on HSYNC, then the machine experiences a lock up. It cannot distinguish the end of one frame from the start of the next frame.
Figure 11-66 VSYNC and HSYNC