The Video Timing Controller v6.2 is updated to remove arbitrary resolutions from Video Mode parameter in GUI and allow default configuration of standard resolutions when the AXI4-LITE interface is not used. For any non-standard resolution, it is recommended to use the Custom option.
The Video Timing Controller v5.00.a added parameters for configuring the core in constant mode, thus the core can be initialized to generate timing after reset without a processor or software.