The Video Mixer has only a hardware reset option, ap_rst_n pin. No software reset option is available. The external reset pulse needs to be held for 16 or more ap_clk cycles to reset the core. The ap_rst_n signal is synchronous to the ap_clk clock domain. The ap_rst_n signal resets the entire core including the AXI4-Lite, AXI4-Stream, and memory mapped AXI4 interfaces.